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6 October, 09:07

If cos x=1/2 and 90°

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  1. 6 October, 09:34
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    When I factor[ 2cos (square) - 5cos - 3], I get (2cos + 1) (cos - 3). 2cos + 1 = 0, 2cos = - 1, cos = - 0.5,. Using inv cos on calculator, I get 120 degree related angle.
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