defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Differential Calculus Evaluation of derivatives
Find \(\rm \frac{d^2y}{dx^2},\ if\ \sqrt{x+y}+\sqrt{y-x}=c\)
1
\(\frac{2}{c}\)
2
\(-\frac{2}{c^2}\)
3
\(\frac{2}{c^2}\)
4
\(\frac{4}{c^2}\)