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Simplifying 5cos(2a) + 3 = 0 Remove parenthesis around (2a) 5cos * 2a + 3 = 0 Reorder the terms for easier multiplication: 5 * 2cos * a + 3 = 0 Multiply 5 * 2 10cos * a + 3 = 0 Multiply cos * a 10acos + 3 = 0 Reorder the terms: 3 + 10acos = 0 Solving 3 + 10acos = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 10acos = 0 + -3 Combine like terms: 3 + -3 = 0 0 + 10acos = 0 + -3 10acos = 0 + -3 Combine like terms: 0 + -3 = -3 10acos = -3 Divide each side by '10cos'. a = -0.3c-1o-1s-1 Simplifying a = -0.3c-1o-1s-1
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