If cos x ( cos x - 2) = 0 where 90° sxs 180°, then x =

90 degrees

Step-by-step 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

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Explanation: