Mathematics

Mathematics

Problem

Which of the following gives the correct expansion of sin⁡(x+y)\sin (x+y)? a) sin⁡xsin⁡y+cos⁡xcos⁡y\sin x\sin y+\cos x\cos y b) sin⁡xcos⁡y+cos⁡xsin⁡y\sin x\cos y+\cos x\sin y c) sin⁡xcos⁡y−cos⁡xsin⁡y\sin x\cos y-\cos x\sin y d) cos⁡xcos⁡y−sin⁡xsin⁡y\cos x\cos y-\sin x\sin y

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