Question

Find the value of cos18/Sin72

Answer 1

cos18 can be written as cos (90 - 18)

so cos (90 - 18)= sin 72

so putting these values in the question

sin 72/ sin 72 = 1

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Answer 2

Cos18°/Sin72°

= Cos(90°-72°)/Sin72°

= Sin72°/Sin72°.

1

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