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Simplifying f(x) = 4cos(2x + 80) + -2 Multiply f * x fx = 4cos(2x + 80) + -2 Reorder the terms: fx = 4cos(80 + 2x) + -2 fx = (80 * 4cos + 2x * 4cos) + -2 fx = (320cos + 8cosx) + -2 Reorder the terms: fx = -2 + 320cos + 8cosx Solving fx = -2 + 320cos + 8cosx Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by 'x'. f = -2x-1 + 320cosx-1 + 8cos Simplifying f = -2x-1 + 320cosx-1 + 8cos Reorder the terms: f = 8cos + 320cosx-1 + -2x-1
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