Question

Cos x = cos 60 cos 30 + sin 60 sin 30

Answer 1

Hey... I think this can be ur answer dear!!

Cos x = cos60*cos 30 +sin60 *sin30
=1/2 * root3/2 + root3/2 *1/2
=root3 /4 + root3/4
=2root3 /4
=root3 /2
Cosx = cos30
x=30 degrees!

Hope it helps you dear!!

Answer 2

Cos x = cos 60 cos 30 + sin 60 sin 30
Cos x = 1/2 × root3/2 + root3/2 × 1/2
Cos x = root3/4 + root3/4
Cos x = 2root3/4
Cos x = root3/2