Answer:
90 degrees
Explanation:
Given the trig expression cos x ( cos x - 2) = 0, we are to find the value of x;
The expression can also be expressed as;
cos x = 0 and cos x - 2 = 0
If cos x = 0
x = cos^-1 0
x = 90
Hence the value of x is 90 degrees
Note that if cos x = 2, then x does not exist in this case