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We need to isolate the dependent variable $a$, we can do that by simultaneously subtracting $3$ from both sides of the equation
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$-4\cos\left(a\right)=-2$
Learn how to solve trigonometric equations problems step by step online. Solve the trigonometric equation 3-4cos(a)=1. We need to isolate the dependent variable a, we can do that by simultaneously subtracting 3 from both sides of the equation. Divide both sides of the equation by -4. Simplifying the quotients. Divide -2 by -4.