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  • Choose the correct option and justify your choice sin 2A = 2 sin A is true when A =

2. Choose the correct option and justify your choice :

 (iii)\sin \: 2A=2\: \sin A is true when A =

 (A)0^{o}                (B)\: 30^{o}                (C)\: 45^{o}                (D)\: 60^{o}

Answers (1)

best_answer

The correct option is (A)
\sin \: 2A=2\: \sin A
We know that \sin 2A = 2\sin A \cos A
So, 2\sin A \cos A = 2\sin A
\\\cos A = 1\\ A = 0^0

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