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If. b sin beta = a sin (2alpha +beta) th...

If. b sin` beta` =` a sin (2alpha +beta)` then the.value of `cot(alpha+beta)/cotalpha`

A

a)`(a-b)/(a+b)`

B

b)`(b-a)/(a+b)`

C

c)`(a+b)/(a-b)`

D

d)`(a+b)/(b-a)`

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UNITED BOOK HOUSE-MODEL QUESTION PAPERS-SET 3-EXERCISE
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  18. Find the sum of the following infinite G.P series 0.9+0.81+0.792+….

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