Question

please help me to solve the sum I will shortly follow that person​

Answer 1

Answer:

(a)cos²30°-sin²30°=cos60°

(√3/2)²-(1/2)²=1/2

3/4-1/4=1/2

3-1/4=1/2

2/4=1/2

1/2=1/2

L.H.S.=R.H.S.

Hence proved