Prove that: cos2 30° - sin2 30° = cos 60°

Prove that:

cos² 30° - sin² 30° = cos 60°

Sum

`(sqrt3/2)^2 - (1/2)^2 = 3/4 - 1/4 = 2/4 = 1/2 = cos60°`

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Chapter 21: Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals] - EXERCISE 21 (C) [Page 322]

Chapter 21 Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals]
EXERCISE 21 (C) | Q 4. (iv) | Page 322