Solve the equation: tan^(-1)sqrt(x^2+x)+...

Solve the equation: `tan^(-1)sqrt(x^2+x)+sin^(-1)sqrt(x^2+x+1)=pi/2`

A

`-1,0`

B

`0, 1`

C

`-1, 1`

D

`-1, 2`

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The correct Answer is:

A

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