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If y= cos ec x -cot x ,then sin x (d^(2...

If ` y= cos ec x -cot x ,then sin x (d^(2)y)/(dx^(2))=`

A

` -(1+ cos x) (dy)/(dx) `

B

` (1+cosx) (dy)/(dx) `

C

` -(1-cos x) ( dy)/(dx) `

D

` (1-cos x)(dy)/(dx) `

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The correct Answer is:
D
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