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Simplifying y = cos(13t) + cos(t) Remove parenthesis around (13t) y = cos * 13t + cos(t) Reorder the terms for easier multiplication: y = 13cos * t + cos(t) Multiply cos * t y = 13cost + cos(t) Multiply cos * t y = 13cost + cost Combine like terms: 13cost + cost = 14cost y = 14cost Solving y = 14cost Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Simplifying y = 14cost
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