One solution.
(cos x)2 - 2cos x = 3
Factor:
(cos x - 3)(cos x + 1)= 0
cos x = {-1, 3}
Solve:
For cos x = -1, x = 180 deg
No solution for cos x = 3
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5
Anything minus itself is zero.
(x + 3)(x - 1)(x + 1)
(-9) / 3 = -3 . Minus nine divided by three is equal to minus three
Three times negative 2 minus three is equal to -9