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if sin^-1(a-a^2/3+a^3/9-.......)+cos^-1(1+b+b^2+........)= π/2 then the value of 'a' and 'b' may be

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sin-1(a-a2/3+a3/9-.......)+cos-1(1+b+b2+........)= π/2  then the value of 'a' and 'b' may be

(A) a = –3 & b = 1

(B) a = 1 & b = –1/3

(C) a = 6 & 1 b =1/2

(D) None of these

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Only (B) satisfy

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