What is the equation of the normal line of f(x)= secxtanxf(x)=secxtanx at x = pi/8x=π8?
1 Answer
Apr 16, 2017
Explanation:
It helps to know some trig derivatives:
First, take the derivative of
Simplify:
Plug in
This is the slope of the tangent line but we need the slope of the normal line. Take the negative reciprocal of
Now we need a point. Plug in
Now we have the point