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List of identities:

Sine of Twice an Angle:

sin⁡〖2a=2 sin⁡〖a cos⁡〖a 〗 〗 〗

Cosine of Twice an Angle:

cos⁡2a=cos^2⁡〖a−sin^2⁡a 〗
cos⁡〖2a=1−sin^2⁡a 〗
cos⁡〖2a=2 cos^2⁡a−1〗

Q. Simplify the expression. (Difficulty: Medium)

sin⁡2x/(1+cos⁡2x )

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