see this thread ...
I am stuck on this trig equation.
Solve the Equation for one function of and find the angle.
ok, step one is write in terms of one function. so looking at it I can't see any easy identity to replace. so I raise power on both sides.
if I raise power again it will not square the other cos. and I can't see any elementary identity to use on it. in the book it says the answer should be