Question

Решить уравнение: (1+cosx)(3-2cosx)=0

Answer 1

$[left[ begin{array}{l} 1 + cos x = 0\ 3 - 2cos x = 0 end{array} right.left[ begin{array}{l} cos x = - 1\ cos x = frac{3}{2} end{array} right.left[ begin{array}{l} x = pi + 2pi n,n in z\ emptyset end{array} right.]$