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प्रश्न
Prove that:
cos2 30° - sin2 30° = cos 60°
बेरीज
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उत्तर
`(sqrt3/2)^2 - (1/2)^2 = 3/4 - 1/4 = 2/4 = 1/2 = cos60°`
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या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 21: Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals] - EXERCISE 21 (C) [पृष्ठ ३२२]
