Trigonometry identities- Test Questions

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Question 11

Question:   Prove the following identity:

Answer:   



Question 12

Question:   Prove the following identity:

Answer:   




Question 13

Question:   Prove the following identity:

Answer:   




Question 14

Question:   Prove the following identity:

Answer:   


Question 15

Question:   Prove the following identity:

Answer:   



Question 16

Question:   Prove the following identity:

Answer:   






Question 17

Question:   Prove the following identity:

Answer:   





Question 18

Question:   Prove the following identity:

Answer:   




Question 19

Question:   Prove the following identity:
sec4q(1-sin4q)-2tan2q = 1.

Answer:   







Question 20

Question:   Prove the following identity:

Answer:   






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