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If A = 45°, verify that sin 2A = 2 sin A cos A. - Mathematics

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Question

If A = 45°, verify that sin 2A = 2 sin A cos A.

Sum
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Solution

A = 45°

⇒ 2A = 2 × 45°

= 90°

sin 2A = sin 90°

= 1

2 sin A cos A = 2 sin 45° cos 45°

= `2 xx 1/sqrt(2) xx 1/sqrt(2)`

= 1

∴ sin 2A = 2 sin A cos A

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Chapter 6: T-Ratios of some particular angles - Exercises

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