Question

If ø=30 verify that, cos 2ø =1 – 2 sin²ø

Answer 1

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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.

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