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MATH / Find the sum of the values of x such that cos³3x+cos³5x=8cos³4xcos³x, where x is measured in degrees and 100^(∘)<x<200^(∘). · Discussion

Discussing Find the sum of the values of x such that cos³3x+cos³5x=8cos³4xcos³x, where x is measured in degrees and 100^(∘)<x<200^(∘). · MATH

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