Question

What is the value of cos36.sin18 ?

Answer 1

0.09609909896

is the value of above answer

Answer 2

To solve this at first we must know some Identities :-

1. Sin(90°-Ø) = CosØ
2. Cos(90°-Ø) = SinØ

Now,

As per question :-

=> Cos36° Sin 18°

=> Cos(90°-54°) Sin(90°-72°)

=> Sin54° Cos72°