Find the slope of the tangent line to x tan y = y - 1 when y = pi/4
The Attempt at a Solution
I can't seem to get the derivative. Here's what I do.
First I used the product rule the left side of the equation and got sec^2 x dy/dx + tan y = dy/dx.
When I simplify, I get dy/dy over dy/dx, which just reduces to 1 so I'm having trouble with getting dy/dx on it own.