1.

If sin^(-1)(x-(x^2)/(2)+(x^3)/(4)-...infty)+cos^(-1)(x^2-(x^4)/(2)+(x^6)/(4)-...infty)=(pi)/(2) and 0ltxltsqrt(2), then x is equal to

Answer»

`1//2`
1
`-1//2`
`-1`

ANSWER :B


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