Question

resolva as equacoes : b) cos²x-cosx=0

Answer 1

cos² x - cos x = 0
cos x( cos x - 1) = 0

cos x = 0         cos x - 1 = 0
                       cos x = 1

Answer 2

cos" x-cos x=0
cos x (cos x-1)=0
cos x=0

cos x-1=0
cos x = 1#