Consider the function
[f(x,y,z)=9x³y²z-4xy⁴z²]
Find the following partial derivatives.
a) ((∂ f/∂ x)(x,y,z)=)
b) ((∂ f/∂ y)(x,y,z)=)
c) ((∂ f/∂ z)(x,y,z)=)
d) ((∂² f/∂ x²)(x,y,z)=)