# What is the equation of the tangent line of #r=cot^2theta - sintheta# at #theta=pi/4#?

##### 1 Answer

Dec 13, 2016

#### Explanation:

This is our instantaneous rate of change (slope of the tangent) when

Then, we can just a point-slope formula to figure out the equation of that tangent line by plugging in values into the original function:

Thus: