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OpenStudy (anonymous):
obtain Yn for y=e^ax . cos(bx + c) and find y- e^x . cos 5x . cos 3x
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OpenStudy (anonymous):
hint cos 5x . cos 3x =1/2 * (cos(5+3)x + cos(5-3)x)=1/2 * (cos8x +cos2x)
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