The sum of solution of equation \( 2 \sin ^{-1} \sqrt{x^{2}+x+1}+\cos ^{-1} \sqrt{x^{2}+x}=\frac...

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The sum of solution of equation \( 2 \sin ^{-1} \sqrt{x^{2}+x+1}+\cos ^{-1} \sqrt{x^{2}+x}=\frac{3 \pi}{2} \) is \( -\lambda \) then \( \lambda \) equals
(a) 0
(b) 1
(c) 2
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