How to find general solution of #costheta=sintheta-1#?
1 Answer
Jun 5, 2018
We conclude
Explanation:
We have to square equations, so we may introduce extraneous roots, so it's necessary to check them at the end. We should always check, but here it's part of the problem proper.
Because we squared the sign of the cosine is ambiguous from the first clause. But only one sign will work. These are really
We conclude