1.

If y = sin x[1/(sin x.sin 2x) + 1/(sin 2x .sin 3x) +...+ 1/(sin nx sin(n + 1)x)]then (dy)/(dx) =

Answer»

`cotx - cot(N + 1)x`
`(n + 1)"cosec"^2(n + 1)x - "cosec"^2X`
`"cosec"^2 x- (n + 1)"cosec"^2(n + 1)x`
`cotx + "cot"(n + 1) x`

ANSWER :C


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