Question

can anyone tell me the answer of cos 36 - cos 72
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Answer 1

Answer:

cos36∘−cos72∘=−2sin54∘sin(−18∘)

[cosA−cosB=2sin(2D−C)(sin2C+D)]

cos36∘−cos72∘=2(45+1)×(45−1)

                              =42=21

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Answer 2

i hope this answer is useful for you