Question

2sin^2 = 2 + cos

Answer 1

replace \(2\sin^2(x)\) by \(2(1-\cos^2(x))\) and solve the resulting quadratic equation

Answer 2

ohhhh! okay

Answer 3

you get
\[2-2\cos^2(x)=2+\cos(x)\]
\[\cos^2(x)+\cos(x)=0\]
\[\cos(x)(1+\cos(x))=0\] etc

Answer 4

how did you get cos^2 + cos = 0?