What is the slope of the tangent line of (x-y)(x+y)-xy+y= C (x−y)(x+y)−xy+y=C, where C is an arbitrary constant, at (1,2)(1,2)?
1 Answer
Feb 2, 2016
The slope of the tangent is
Explanation:
Instead of differentiating immediately, let's rewrite the first product.
This form is (I think) simpler to differentiate.
At the point
Solve for