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Simplifying sin(5x) + sin(7x) = cos(x) Remove parenthesis around (5x) ins * 5x + sin(7x) = cos(x) Reorder the terms for easier multiplication: 5ins * x + sin(7x) = cos(x) Multiply ins * x 5insx + sin(7x) = cos(x) Remove parenthesis around (7x) 5insx + ins * 7x = cos(x) Reorder the terms for easier multiplication: 5insx + 7ins * x = cos(x) Multiply ins * x 5insx + 7insx = cos(x) Combine like terms: 5insx + 7insx = 12insx 12insx = cos(x) Multiply cos * x 12insx = cosx Solving 12insx = cosx Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Divide each side by '12nsx'. i = 0.08333333333cn-1o Simplifying i = 0.08333333333cn-1o
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