# How do you find the derivative of #y=x^2-1/2costheta#?

##### 1 Answer

Mar 1, 2017

The function:

# y=x^2-1/2cos theta #

is a function of **two** variables so the term "derivative" is completely ambiguous.

We can, however, form the partial derivatives;

# (partial y) / (partial x) = 2x #

# (partial y) / (partial theta) = 1/2sintheta #