Question

Q.85
Let f(x) = Lim
{sinx + 2sin’x + 3sin’x +...
no
..+nsin"x} If sinx #nt + 7/2, n e I:
1
Evaluate : Lim (1-sin x)?f(x)]
sinx-1
=
(1) 1
(3) e
(2)0
(4) None of these​

Answer 1

(1) 1

hope it is correct ans