If tan theta=sqrt(3/2) and the sum of t...

If `tan theta=sqrt(3/2)` and the sum of the infinite series `1+2(1-cos theta)+3(1-cos theta)^2+4(1-cos theta)^3+.........+oo` is `lambda/2` then the value of `lambda` is (1) 2 (2) 5 (3) 1 (4) 4

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