Question

If sin 45° sin A= √3\2 then what is the value of cos 3A?

Answer 1

The complex number is obtained when we find the value for cosA.

Answer 2

We know that

sin 45° sin A=sin 60°(sin 60°=√3/2)

sinA=sin 60°-sin 45°

sin A=sin 15°

A=15°

then a/q

cos 45°=1/√2

I hope this answer will help you...