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For the following exercises, evaluate each root.

Evaluate the cube root of z when z = 64 cis ( 210° ) .

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Evaluate the square root of z when z = 25 cis ( 3 π 2 ) .

5 cis ( 3 π 4 ) , 5 cis ( 7 π 4 )

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For the following exercises, plot the complex number in the complex plane.

Parametric Equations

For the following exercises, eliminate the parameter t to rewrite the parametric equation as a Cartesian equation.

{ x ( t ) = 3 t 1 y ( t ) = t

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{ x ( t ) = cos t y ( t ) = 2 sin 2 t  

x 2 + 1 2 y = 1

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Parameterize (write a parametric equation for) each Cartesian equation by using x ( t ) = a cos t and y ( t ) = b sin t for x 2 25 + y 2 16 = 1.

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Parameterize the line from ( 2 , 3 ) to ( 4 , 7 ) so that the line is at ( 2 , 3 ) at t = 0 and ( 4 , 7 ) at t = 1.

{ x ( t ) = 2 + 6 t y ( t ) = 3 + 4 t

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Parametric Equations: Graphs

For the following exercises, make a table of values for each set of parametric equations, graph the equations, and include an orientation; then write the Cartesian equation.

{ x ( t ) = 3 t 2 y ( t ) = 2 t 1

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{ x ( t ) = e t y ( t ) = 2 e 5 t

y = 2 x 5

Plot of the given parametric equations.
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{ x ( t ) = 3 cos t y ( t ) = 2 sin t

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A ball is launched with an initial velocity of 80 feet per second at an angle of 40° to the horizontal. The ball is released at a height of 4 feet above the ground.

  1. Find the parametric equations to model the path of the ball.
  2. Where is the ball after 3 seconds?
  3. How long is the ball in the air?
  1. { x ( t ) = ( 80 cos ( 40° ) ) t y ( t ) = 16 t 2 + ( 80 sin ( 40° ) ) t + 4
  2. The ball is 14 feet high and 184 feet from where it was launched.
  3. 3.3 seconds
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Vectors

For the following exercises, determine whether the two vectors, u and v , are equal, where u has an initial point P 1 and a terminal point P 2 , and v has an initial point P 3 and a terminal point P 4 .

P 1 = ( 1 , 4 ) , P 2 = ( 3 , 1 ) , P 3 = ( 5 , 5 ) and P 4 = ( 9 , 2 )

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P 1 = ( 6 , 11 ) , P 2 = ( 2 , 8 ) , P 3 = ( 0 , 1 ) and P 4 = ( 8 , 2 )

not equal

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For the following exercises, use the vectors u = 2 i j , v = 4 i 3 j , and w = 2 i + 5 j to evaluate the expression.

For the following exercises, find a unit vector in the same direction as the given vector.

b = −3 i j

3 10 10 i 10 10 j

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For the following exercises, find the magnitude and direction of the vector.

−3 , −3

Magnitude: 3 2 , Direction: 225°

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For the following exercises, calculate u v .

u = −2 i + j and v = 3 i + 7 j

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u = i + 4 j and v = 4 i + 3 j

16

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Given v = −3 , 4 draw v , 2 v , and 1 2 v .

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Given the vectors shown in [link] , sketch u + v , u v and 3 v .

Diagram of vectors v, 2v, and 1/2 v. The 2v vector is in the same direction as v but has twice the magnitude. The 1/2 v vector is in the same direction as v but has half the magnitude.


Diagram of vectors u and v. Taking u's starting point as the origin, u goes from the origin to (4,1), and v goes from (4,1) to (6,0).

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Given initial point P 1 = ( 3 , 2 ) and terminal point P 2 = ( 5 , 1 ) , write the vector v in terms of i and j . Draw the points and the vector on the graph.

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Practice test

Assume α is opposite side a , β is opposite side b , and γ is opposite side c . Solve the triangle, if possible, and round each answer to the nearest tenth, given β = 68° , b = 21 , c = 16.

α = 67.1° , γ = 44.9° , a = 20.9

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Find the area of the triangle in [link] . Round each answer to the nearest tenth.

A triangle. One angle is 60 degrees with opposite side 6.25. The other two sides are 5 and 7.
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A pilot flies in a straight path for 2 hours. He then makes a course correction, heading 15° to the right of his original course, and flies 1 hour in the new direction. If he maintains a constant speed of 575 miles per hour, how far is he from his starting position?

1712 miles

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Convert ( 2 , 2 ) to polar coordinates, and then plot the point.

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Convert ( 2 , π 3 ) to rectangular coordinates.

( 1 , 3 )

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Convert the polar equation to a Cartesian equation: x 2 + y 2 = 5 y.

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Convert to rectangular form and graph: r = 3 csc θ .

y = 3

Plot of the given equation in rectangular form - line y=-3.
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Test the equation for symmetry: r = 4 sin ( 2 θ ).

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Graph r = 3 + 3 cos θ .


Graph of the given equations - a cardioid.

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Graph r = 3 5 sin θ .

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Find the absolute value of the complex number 5 9 i .

106

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Write the complex number in polar form: 4 + i .

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Convert the complex number from polar to rectangular form: z = 5 cis ( 2 π 3 ) .

5 2 + i 5 3 2

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Given z 1 = 8 cis ( 36° ) and z 2 = 2 cis ( 15° ) , evaluate each expression.

z 1

2 2 cis ( 18° ) , 2 2 cis ( 198° )

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Plot the complex number −5 i in the complex plane.

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Eliminate the parameter t to rewrite the following parametric equations as a Cartesian equation: { x ( t ) = t + 1 y ( t ) = 2 t 2 .

y = 2 ( x 1 ) 2

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Parameterize (write a parametric equation for) the following Cartesian equation by using x ( t ) = a cos t and y ( t ) = b sin t : x 2 36 + y 2 100 = 1.

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Graph the set of parametric equations and find the Cartesian equation: { x ( t ) = 2 sin t y ( t ) = 5 cos t .


Graph of the given equations - a vertical ellipse.

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A ball is launched with an initial velocity of 95 feet per second at an angle of 52° to the horizontal. The ball is released at a height of 3.5 feet above the ground.

  1. Find the parametric equations to model the path of the ball.
  2. Where is the ball after 2 seconds?
  3. How long is the ball in the air?
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For the following exercises, use the vectors u = i − 3 j and v = 2 i + 3 j .

Find 2 u − 3 v .

−4 i − 15 j

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Find a unit vector in the same direction as v .

2 13 13 i + 3 13 13 j

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Given vector v has an initial point P 1 = ( 2 , 2 ) and terminal point P 2 = ( 1 , 0 ) , write the vector v in terms of i and j . On the graph, draw v , and v .

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Questions & Answers

sin theta=3/4.prove that sec square theta barabar 1 + tan square theta by cosec square theta minus cos square theta
Umesh Reply
I want to know trigonometry but I can't understand it anyone who can help
Siyabonga Reply
Yh
Idowu
which part of trig?
Nyemba
functions
Siyabonga
trigonometry
Ganapathi
differentiation doubhts
Ganapathi
hi
Ganapathi
hello
Brittany
Prove that 4sin50-3tan 50=1
Sudip Reply
f(x)= 1 x    f(x)=1x  is shifted down 4 units and to the right 3 units.
Sebit Reply
f (x) = −3x + 5 and g (x) = x − 5 /−3
Sebit
what are real numbers
Marty Reply
I want to know partial fraction Decomposition.
Adama Reply
classes of function in mathematics
Yazidu Reply
divide y2_8y2+5y2/y2
Sumanth Reply
wish i knew calculus to understand what's going on 🙂
Dashawn Reply
@dashawn ... in simple terms, a derivative is the tangent line of the function. which gives the rate of change at that instant. to calculate. given f(x)==ax^n. then f'(x)=n*ax^n-1 . hope that help.
Christopher
thanks bro
Dashawn
maybe when i start calculus in a few months i won't be that lost 😎
Dashawn
what's the derivative of 4x^6
Axmed Reply
24x^5
James
10x
Axmed
24X^5
Taieb
Thanks for this helpfull app
Axmed Reply
secA+tanA=2√5,sinA=?
richa Reply
tan2a+tan2a=√3
Rahulkumar
classes of function
Yazidu
if sinx°=sin@, then @ is - ?
NAVJIT Reply
the value of tan15°•tan20°•tan70°•tan75° -
NAVJIT
0.037 than find sin and tan?
Jon Reply
cos24/25 then find sin and tan
Deepak Reply

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Source:  OpenStax, Algebra and trigonometry. OpenStax CNX. Nov 14, 2016 Download for free at https://legacy.cnx.org/content/col11758/1.6
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