or
You can't just divide away from both sides since it's not a constant. If you do that, you'll miss out on all the solutions where
It's similar to this equation: has obviously got one root , but if you divide both sides with without taking that into consideration you'll end up with , and thus miss a root.
The general solution to is or where is the angle and
The general solution to is where is the angle and
good night, I offer you a resolution
2shared - download R1.pdf