Question

If cos x=cos60° cos30°+sin60° sin30°, then find the value of x.

Answer 1

$\Huge\mathcal\red{Answer}$

cos 60 is 1/2

cos30 is √3/2

sin60 is √3/2

sin30 is 1/2

so ,cos60 × cos 30 + sin60 × sin30 = 2×(√3/4)= √3/2

cosx = √3/2

therefore x = 60