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Cos x = -1/2 - Math Central

Sender: Pierre Boivin trigonometric equation, extending solution. 2cos -5cos-3 = 0 for between -360 and 720 degree 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...

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