1. Which of the following are trigonometric identities? Select all that apply. (view attachments for answer choices)

3. Which statements are true? Select all that apply.
(view attachments for answer choices; ignore #4)

5. Which of the following are true statements? Select all that apply.
(view attachments for answer choices; ignore #4)

8. Which statement is true?
(view attachments for answer choices)

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11. What is a possible value of sin(theta) when cos 2(theta)=0.21?
A. 0.32
B. 0.37
C. 0.63
D. 0.68

18. View attachment.

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20. View attachment.