Thread: sum of cosines
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Old January 14th, 2009, 03:23 AM
qwerty321 qwerty321 is offline
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Default sum of cosines

I have the function: y(t) = (cos(300πt) + sin(500πt))^3

I need too expand the expression of y to get a sum of cosines with positive frequencies. Using
trigonometric identities find the frequencies of resulting sine waves.Can someone help me with that?
Thank you

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