# CBSE Class 11-science Answered

**Prove that 2sin^2 y + 4cos(x + y) sinxsiny ny + cos 2 * (x + y) = cos 2x**

Asked by apnp31 | 21 Sep, 2020, 12:19: PM

Expert Answer

To prove: 2sin

^{2}y + 4cos(x+y) sinx siny + cos2(x+y) = cos2xHence, proved.

Answered by Renu Varma | 22 Sep, 2020, 01:37: PM

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