Question 829440
Verify tan^2x-cot^2x/tanx+cotx=tanx-cot x
{{{(tan^2(x)-cot^2(x))/(tan(x)+cot(x))=tan(x)+cot(x)}}}
..
{{{(tan^2(x)-cot^2(x))/(tan(x)+cot(x))=(tan(x)+cot(x))(tan(x)-cot(x))/(tan(x)+cot(x))=tan(x)-cot(x)}}}
verified: left side=right side