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Simplifying 25cos2(0) = 0 Reorder the terms for easier multiplication: 25 * 0cos2 = 0 Multiply 25 * 0 0cos2 = 0 Anything times zero is zero. 0cos2 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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