Question

cos 2x + 3cossx + 2 =0 find th exact solution of the given equation in the interval [0,2pi)

Answer 1

well I'll assume its

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

this can be factored to

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

now some each for the factors for x.