Question

2cos^2(x)-3cos(x)=-1

solve for x in[0,2pi) that is 0 lessen or eual to x <2pi

Answer 1

this is an equation that can be reduced to a quadratic

if you rewrite the equation you get

\[2\cos^2(x) - 3\cos(x) + 1 = 0\]

which is an equation that can be factored..