Question

Please help me with this question

Answer 1

Answer:

put the values and you will get ans.

hope it helps you..

Answer 2

Step-by-step explanation:

cos 60°=1/2 and cos 30°=√3/2

L. H. S=cos(60°-30°)

=cos 30°=√3/2

R. H. S=cos A cos B +sin A sin B

=cos 60° cos 30°+ sin 60°+ sin 30°

=1/2*√3/2+√3/2*1/2

=√3/4+√3/4

=2√3/4

=√3/2

L. H. S=R.H.S

HENCE PROVED