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Uploaded by Applicationbijective on May 29, 2009
cos(2x) = 2*(cos(x))^2 - 1=2*(cos(x))² - 1sin(2x) = 2*sin(x)*cos(x)cos(nx) = Re[(cosx +isinx)^n]sin(nx) = Im[(cosx +isinx)^n]
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