For each function below find the requested partial derivatives. Note that $f_x$ is equivalent to $\partial f/\partial x$.
If $f(x,y) = x^6 y + x^3 + 3$ then
$f_x =$
$f_y =$
If $f(x,t) = \ln(t) \sqrt{x}$ then
$f_x =$
$f_t =$
Remember that square roots can be entered using "sqrt" (e.g. $\sqrt{2}$ is entered using "sqrt(2)")
If $f(x,y) = \frac{18 x^6}{y^3}$ then
$f_x =$
$f_y =$
If $w(u,v) = \frac{e^v}{v^2+u^2}$ then
$w_u =$
$w_v =$
If $f(x,y,z) = z e^{x y z}$ then
$f_x =$
$f_y =$
$f_z =$