# I'm having loads of trouble

1. May 2, 2005

### RadiationX

for some reason i cant figure out how to solve this very simple trig equation.
$$1 + \cos{\theta} = 2\sin{\theta}$$ i need this so that i can solve something else. ANY IDEAS WOULD HELP ME OUT.

normally i can solve things like this but for some reason tonight i can't see what to do. to make matters worse this is due in the morning at 9am!

2. May 2, 2005

### xanthym

a) Square both sides.
b) Sub {1 - cos2(θ)} for sin2(θ).
c) Sub {x = cos(θ)}.
d) Solve quadratic.
e) Determine all candidate "θ" solutions.
f) CHECK EACH candidate "θ" solution with ORIGINAL EQUATION.

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