partial derivative of x*e^(y*z) with respect to y
Differentiate with respect to y while holding x, z constant
Let's perform the differentiation: ddy(xe(yz))
Apply the differentiation rule: ddx(exp(f)) = ddx(f)·exp(f) with f = yz
x·ddy(yz)·e(yz)
xze(yz)
▶Derivative:   e(yz)xz