Question

Solve: cos(x)(cos(x)-1)=0

Please explain. Thank you!

Answer 1

what have you done so far?

Answer 2

I feel that the answer is D. because cos(x)=0 or cos(x)-1=0 => cos(x)=1
cos (x)=0 => x= kpi/2, where k is an odd number
cos (x) =1 => m pi wkere is an even number