हिंदी

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

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प्रश्न

Prove that:

cos2 30°  - sin2 30° = cos 60°

योग
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उत्तर

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

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अध्याय 21: Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals] - EXERCISE 21 (C) [पृष्ठ ३२२]

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सेलिना Concise Mathematics [English] Class 9 ICSE
अध्याय 21 Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals]
EXERCISE 21 (C) | Q 4. (iv) | पृष्ठ ३२२
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