Precalculus : Trigonometric Functions

Study concepts, example questions & explanations for Precalculus

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Example Questions

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Example Question #1 : Trigonometric Functions

Which of the following is the correct domain of , where  represents an integer?

Possible Answers:

Correct answer:

Explanation:

The cotangent graph only has a period of  intervals and is most similar to the tangent graph.  The domain of cotangent exists everywhere except every  value since an asymptote exists at those values in the domain.  

The y-intercept of 3 shifts the cotangent graph up by three units, so this does not affect the domain.

Therefore, the graph exists everywhere except , where  is an integer.

Example Question #2 : Determine The Domain Of A Trigonometric Function

Please choose the best answer from the following choices.

What is the domain of the following function?

Possible Answers:

Correct answer:

Explanation:

All x values make the function work. Thus, making the domain   . They're parentheses instead of brackets because parentheses are used when you can't actually use the specific value next to it. It is impossible to use infinity which makes parentheses appropriate. Brackets are used when you CAN use the specific value next to it.

Example Question #3 : Determine The Domain Of A Trigonometric Function

Please choose the best answer from the following choices.

 

What is the domain of the following function:

Possible Answers:

Correct answer:

Explanation:

All x values work for the function. Thus, making the domain all real numbers. Parentheses are required because you can never actually use the number infinity.

Example Question #4 : Determine The Domain Of A Trigonometric Function

Please choose the best answer from the following choices.

What is the domain of .

Possible Answers:

Correct answer:

Explanation:

If you look at a graph of the function, you can see that every curve has a vertical asymptote that repeats every  radians in the positive and negative x-direction, starting at  radians.  Also, the curve has a length that stretches  radians which makes the domain .

Example Question #1 : Trigonometric Functions

What is the restriction of the domain of the function given by:

For all the answer choices below,  is any integer. 

Possible Answers:

Correct answer:

Explanation:

 has restrictions on its domain such that

 , where  is any integer. 

To determine the domain for 

we equate the terms within the secant function and set them equal to the original domain restriction. 

Solving for 

The new domain restriction is:

 where  is an integer

Example Question #1 : Trigonometric Functions

Solve the following:  

Possible Answers:

Correct answer:

Explanation:

Rewrite  in terms of sine and cosine functions.

Since these angles are special angles from the unit circle, the values of each term can be determined from the x and y coordinate points at the specified angle.  

Solve each term and simplify the expression.

Example Question #3 : Trigonometric Functions

Q1 new

Find the value of .

Possible Answers:

Correct answer:

Explanation:

Using trigonometric relationships, one can set up the equation

.

Solving for ,

Thus, the answer is found to be 29.

Example Question #4 : Trigonometric Functions

Q2 new

Find the value of .

Possible Answers:

Correct answer:

Explanation:

Using trigonometric relationships, one can set up the equation

.

Plugging in the values given in the picture we get the equation,

.

Solving for ,

.

Thus, the answer is found to be 106.

Example Question #5 : Trigonometric Functions

Find all of the angles that satistfy the following equation:

Possible Answers:

 

OR 

Correct answer:

OR 

Explanation:

The values of  that fit this equation would be:

 and  

because these angles are in QI and QII where sin is positive and where

.

This is why the answer 

is incorrect, because it includes inputs that provide negative values such as:

Thus the answer would be each  multiple of  and  , which would provide the following equations:

  OR    

Example Question #6 : Trigonometric Functions

Simplify:  

Possible Answers:

Correct answer:

Explanation:

To simplify , find the common denominator and multiply the numerator accordingly.

The numerator is an identity.

Substitute the identity and simplify.

 

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