Question

Prove that: cos 60° cos 30°+ sin 60° sin 30°= cos 30°

Answer 1

Step-by-step explanation:

cos 60° cos 30°+ sin 60° sin 30°

1/2(√3/2)+(√3/2)(1/2)

√3/4+√3/4

√3/2

=cos 30°

hence proved

Answer 2

Step-by-step explanation:

We know

$\frac{ \sqrt{3} }{2} = cos \: 30$