engineering recuitment AAI JE Technical Mock Test 2020-21 Engineering Mathematics Calculus Differentiability
If \(v = {\left( {{x^2} + {y^2} + {z^2}} \right)^{ - \frac{1}{2}}},~then~~\frac{{{\partial ^2}v}}{{\partial {x^2}}} + \frac{{{\partial ^2}v}}{{\partial {y^2}}} + \frac{{{\partial ^2}v}}{{\partial {z^2}}}\) is
1
-1/2
2
-1
3
0
4
1