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Simplifying cos(x + 30) + cos(90 + -1x) = 0 Reorder the terms: cos(30 + x) + cos(90 + -1x) = 0 (30 * cos + x * cos) + cos(90 + -1x) = 0 (30cos + cosx) + cos(90 + -1x) = 0 30cos + cosx + (90 * cos + -1x * cos) = 0 30cos + cosx + (90cos + -1cosx) = 0 Reorder the terms: 30cos + 90cos + cosx + -1cosx = 0 Combine like terms: 30cos + 90cos = 120cos 120cos + cosx + -1cosx = 0 Combine like terms: cosx + -1cosx = 0 120cos + 0 = 0 120cos = 0 Solving 120cos = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '120'. cos = 0.0 Simplifying cos = 0.0 The solution to this equation could not be determined.
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