Q 3031180922.     Which of the following relations is/are an identity?

A

`\sin x^2=2 \sin frac {x^2}{2} \cos frac {x^2}{2}`

B

` \sin x= frac {2 \tan frac {x}{2}}{1+\tan^2 frac {x}{2}}`

C

`\log xy=\log |x| + \log |y|`

D

`\sqrt {1-\sin^2x}=\cos x`

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