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Simplifying cos2(y) = 4cos(y) + -1 Multiply cos2 * y cos2y = 4cos(y) + -1 Multiply cos * y cos2y = 4cosy + -1 Reorder the terms: cos2y = -1 + 4cosy Solving cos2y = -1 + 4cosy Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-4cosy' to each side of the equation. -4cosy + cos2y = -1 + 4cosy + -4cosy Combine like terms: 4cosy + -4cosy = 0 -4cosy + cos2y = -1 + 0 -4cosy + cos2y = -1 Reorder the terms: 1 + -4cosy + cos2y = -1 + 1 Combine like terms: -1 + 1 = 0 1 + -4cosy + cos2y = 0 The solution to this equation could not be determined.
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