1.

If `sin^-1 x+sin^-1y=(2pi)/3,` then `cos^-1 x +cos^-1 y` is equal toA. `(2pi)/(3)`B. `(pi)/(3)`C. `(pi)/(6)`D. `pi`

Answer» We have
`sin^(-1)x+sin^(-1)y=(2pi)/(3)`
`rarr (pi)/(2) cos^(-1)x+(pi)/(2)-cos^(-1)y=(2pi)/(3)`
`rarr cos^(-1)x+cos^(-1)y=pi-(2pi)/(3)=(pi)/(3)`


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