Trigonometric Identities

Ah, never mind, I have to convert it in to a trinomial: 2(1 - sin² x) + sin x - 1 and solve for the angle, which I know how to do. Thanks for helping!

2 cos^2 x = 1 - sin x   ???

Notice that this isn't an identity, Shades......

Look at the graph, here : https://www.desmos.com/calculator/i6af8j74gp

To be an identity, the curves would have to lie on top of each other....they are clearly separate

Maybe you copied it incorrectly???