trigonometry

Question: In triangle ABC, the value of $\sin 2A+\sin 2B+\sin 2C$ is equal to



1) $4\sin A.\,\sin B.\,\sin C$
2) $4\cos A.\,\cos B.\,\cos C$
3) $2\cos A.\,\cos B.\,\cos C$
4) $2\sin A.\,\sin B.\,\,\sin C$
Solution: Explanation: No Explanation
Maximum & minimum values of trigonometric functions Conditional trigonometric identities

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