Trigonometry Relations- Test Questions-iii

Question 21

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Answer:   
By componendo and dividendo

Question 22

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Answer:   

Question 23

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Answer:   

Question 24

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Question 25

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Question 26

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Taking the product of two sides and cancelling the factors common to both sides, we get

Question 27

Question:  

Answer:    LHS = sin 36^o sin 72^o sin 108^o sin 144^o

Question 28

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Answer:   

Question 29

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Answer:   

Question 30

Question:   Prove that

Answer: