Find the second-order partial derivative fxyyf_{xyy}fxyy for f(x,y)=x2cos(y)+exyf(x, y) = x^2 \cos(y) + e^{xy}f(x,y)=x2cos(y)+exy.
x2cosy+x3exyx^2 \cos y + x^3 e^{xy}x2cosy+x3exy
x2siny+xexyx^2 \sin y + x e^{xy}x2siny+xexy
2xsiny+x2exy2x \sin y + x^2 e^{xy}2xsiny+x2exy
−2xsiny+x2exy-2x \sin y + x^2 e^{xy}−2xsiny+x2exy