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Simplifying Cos(2x) + 5cosx + 4 = 0 Remove parenthesis around (2x) osC * 2x + 5cosx + 4 = 0 Reorder the terms for easier multiplication: 2osC * x + 5cosx + 4 = 0 Multiply osC * x 2osxC + 5cosx + 4 = 0 Reorder the terms: 4 + 5cosx + 2osxC = 0 Solving 4 + 5cosx + 2osxC = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + 5cosx + -4 + 2osxC = 0 + -4 Reorder the terms: 4 + -4 + 5cosx + 2osxC = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 5cosx + 2osxC = 0 + -4 5cosx + 2osxC = 0 + -4 Combine like terms: 0 + -4 = -4 5cosx + 2osxC = -4 Add '-2osxC' to each side of the equation. 5cosx + 2osxC + -2osxC = -4 + -2osxC Combine like terms: 2osxC + -2osxC = 0 5cosx + 0 = -4 + -2osxC 5cosx = -4 + -2osxC Divide each side by '5osx'. c = -0.8o-1s-1x-1 + -0.4C Simplifying c = -0.8o-1s-1x-1 + -0.4C Reorder the terms: c = -0.4C + -0.8o-1s-1x-1
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