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sin 2A = 2 sin A is true when A = A. 0° B. 30° C. 45° D. 60°

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sin 2A = 2 sin A is true when A = 

A. 0° 

B. 30° 

C. 45° 

D. 60°

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1 Answer

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Best answer

Sin 2 A = 2 sin A 

[∵ 2A = 2 sin A. Cos A] 

⇒ 2 sin A . cos A = 2 sin A 

⇒ cos A = 1 = cos 0° 

⇒ A = 0°

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