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If y =sinx.sin2x.sin3x………. Sinnx,then y'...

If y =sinx.sin2x.sin3x………. Sinnx,then y' is

A

`yunderset(k=1)overset(n)Sigmak` tankx

B

`yunderset(k=1)overset(n)Sigmak` cotkx

C

`yunderset(k=1)overset(n)Sigmak` tankn

D

`yunderset(k=1)overset(n)Sigma`cotkx

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