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Question

If y=sin x+sin x+sin x+.....,then dydx is equal to

A
2y1cos x
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B
cos x2y1
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C
2x1cos x
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D
cos x2x1
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Solution

The correct option is B cos x2y1
y=sin x+yy2y=sin x
(2y1)dydx=cos x

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