1.

If sin^(-1)(a-(a^(2))/3+(a^(3))/9+…..)+cos^(-1)(1+b+b^(2)=……..)=(pi)/2 then

Answer»

`B=(2A-3)/(3A)`
`b=(3a-2)/(2a)`
`a=3/(2-3b)`
`a=2/(3-2b)`

ANSWER :A::C::D


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