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lim(hto0)(cos^(2)(x+h)-cos^(2)x)/(h) is ...

`lim_(hto0)(cos^(2)(x+h)-cos^(2)x)/(h)` is equal to :

A

`cos^(2)x`

B

(-sin 2x)

C

sin x cos x

D

2 sin x

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The correct Answer is:
B
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