Question

Evaluate : sin18°/cos72°

Answer 1

= sin (90° - 18°) /cos 72° 

    = cos 72° /cos 72° = 1

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Answer 2

Heya!! Here is your answer friend ⤵⤵
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$\sin(18) \div \cos(72) \\ \sin(90 - 72) \div \cos(72) \\ \\ now \: we \: know \: that \: sin(90 - \alpha ) = \cos( \alpha ) \\ \\ we \: have \: \cos(72) \div \cos(72) \\ answer = 1$
Hope it helps you ✌✌