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If 1+2sin x+3sin^(2)x+4sin^(3)x+... upto...

If `1+2sin x+3sin^(2)x+4sin^(3)x+...` upto infinite terms = 4 and number of solutions of the equation in `[ (-3pi)/(2), 4pi] ` is k.
The value of k is equal to

A

4

B

5

C

6

D

7

Text Solution

Verified by Experts

The correct Answer is:
B
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