# Worksheet: Evaluating Trigonometric Functions Using Cofunction Identities

In this worksheet, we will practice using cofunction and odd/even identities to find the values of trigonometric functions.

**Q2: **

Which of the following is equal to ?

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- D

**Q3: **

Find the value of given where .

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- D

**Q6: **

Find the value of giving the answer in its simplest form.

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**Q7: **

Find the value of .

- A1
- B
- C
- D2
- E

**Q8: **

is a right-angled triangle at . Find given .

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- D

**Q9: **

Simplify .

**Q10: **

Find the value of .

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- E

**Q11: **

Find the value of given where .

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**Q12: **

In the figure, points and lie on the unit circle, and .

Express the values of sine, cosine, and tangent of in terms of their values for . Check whether this is valid for all values of .

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- E

**Q13: **

Simplify .

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- D

**Q14: **

Find the value of .

**Q15: **

Find in degrees given where is an acute angle.

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- D

**Q16: **

Find in degrees given where is an acute angle.

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- D

**Q17: **

Given that , find the value of .

**Q18: **

Given that , find the value of .

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- E

**Q19: **

Find given is in standard position and its terminal side passes through the point .

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- D

**Q20: **

Find given is in standard position and its terminal side passes through the point .

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- D

**Q21: **

Find given is in standard position and its terminal side passes through the point .

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- B
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- D

**Q22: **

Find given is in standard position and its terminal side passes through the point .

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- D

**Q23: **

Find given is in standard position and its terminal side passes through the point .

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- B
- C
- D

**Q24: **

Find given is in standard position and its terminal side passes through the point .

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- B
- C
- D

**Q25: **

Find given is in standard position and its terminal side passes through the point .

- A
- B
- C
- D