Question

Evaluate: Sin 18°\Cos72°​

Answer 1

$\huge\underline\bold\color{red}\mathfrak{Answer}$

= sin 18°/cos72°

= sin(90 - 72)°/cos72°

= cos72°/cos72°

= 1

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Answer 2

Answer:

sin18°\cos72°

=sin18°\sin(90°-18°)

sin18°\sin18°

1//