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Simplifying cos(4x) = -1 Remove parenthesis around (4x) cos * 4x = -1 Reorder the terms for easier multiplication: 4cos * x = -1 Multiply cos * x 4cosx = -1 Solving 4cosx = -1 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '4osx'. c = -0.25o-1s-1x-1 Simplifying c = -0.25o-1s-1x-1
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