How do you multiply and simplify (tany-coty)(tany+coty)?
1 Answer
Mar 28, 2018
(tany-coty)(tany+coty) -= tan^2y-cot^2y
Explanation:
We have an expression,
E = (tany-coty)(tany+coty)
This is the difference of two squares, thus we can write:
E = tan^2y-cot^2y
The issue of "simplify" is somewhat ambiguous - there are many other ways we can write the expression!