Consider a function f = y^x, then the value of \(\left( {\frac{{{\partial ^2}f}}{{\partial x\partial y}}} \right)\) at point (2, 1) is -

-1

None of these

Consider a function f = yx, then the value of \(\left( {\frac{{{\partial ^2}f}}{{\partial x\partial y}}} \right)\) at point (2, 1) is -