Elissa89
- 52
- 0
So the problem is sin(x)-1=cos(x) and I don't know how to do this one.
Klaas van Aarsen said:Which formulas do you have available to add/subtract sine and/or cosine?
Elissa89 said:I don't know what you mean.
greg1313 said:I don't think it has to be too complicated. :)
Square both sides of the given equation (post back if you don't know how to do that) and use the identity $\cos^2(x)=1-\sin^2(x)$. Simplify and solve the resulting equation, then check your results with the given equation.
Elissa89 said:I did that but I'm still lost. My professor emailed me back, said to square both sides the squared cos can be turned into sines using the pythagorean theorem identity. Which doesn't make sense to me because the pythagorean theorem identity still has cosines in it?
Sorry I'm replying so late.