Veeky Forums can you tell me where I am going wrong? What am I not seeing?

Veeky Forums can you tell me where I am going wrong? What am I not seeing?

I'm suppose to solve the equation

bump

sin^2 theta minus itself is zero not negative sin^2theta

im getting:

1sin^2 x being subtracted by 2sin^2 x

1-2 is -1

1sin^2-2sin^2 = -1sin^2

theta is quadratical to the minus, you have to use the feces theory that is derived from feceticus FUCK FUCK FUCK

The first - sign on the right hand side came out of nowhere

on the second line i mean

my erasing was horrible

the equation is

sin^2theta = 4 - 2cos^2theta

Why did you square root both sides then divide by -1? You have a -sin^2(theta) if you take the square root of that you will have isin(theta) if you divide by negative one before square rooting you will get an i somewhere on the right instead. You also haven't solved for theta, you got part way to the solution and stopped.

no solutions, look at the problem again