Question

This dot . = Multiply
Find cos30°.cos60°.cos90°

Answer 1

First, we shall have the values of cos 30°, cos 60° & cos 90°.
cos 30° = $\frac{ \sqrt{3} }{2}$

cos 60° = $\frac{1}{2}$

& cos 90° = 0.

Therefore, 
putting the values,
we get,
cos 30°.cos 60°.cos 90° = 0 (Ans)

Answer 2

Hi friend !

Here are the values required to find the ans :


cos 30° = √3/2
cos 60° = 1/2
cos 90° = 0

cos 30° ×cos 60° ×cos 90°
= √3/2 × 1/2 ×0
= 0


cos 30° ×cos 60° ×cos 90° = 0