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The cosine of $3$ equals
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$4\cdot -\frac{99}{100}x-3=0$
Learn how to solve trigonometric equations problems step by step online. Solve the equation 4cos(3)x-3=0. The cosine of 3 equals . Multiply 4 times -\frac{99}{100}. We need to isolate the dependent variable , we can do that by simultaneously subtracting -3 from both sides of the equation. Canceling terms on both sides.