1.

d/(dx)[cos^(-1)(xsqrtx-sqrt((1-x)(1-x^2)))] =

Answer»

`1/(SQRT(1-x^2))-1/(2sqrt(x-x^2))`
`(-1)/(sqrt(1-x^2))-1/(2sqrt(x-x^2))`
`1/(sqrt(1-x^2))+1/(2sqrt(x-x^2))`
`1/(sqrt(1-x^2))`

ANSWER :B


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