Question

Taking theta =30° .verify that Cos^2 theta= 1-2sin^2theta

Answer 1

HERE YOUR ANSWER.......

Answer 2

✓ LHS = cos²(theta) = Cos² 30° = 3/4
✓ RHS = 1-2 sin²(theta) = 1- 2 sin² 30° = 1- 2×1/4 = 1/2

LHS ≠ RHS

Hence, Above relation is incorrect.