MATH ONLINE

Tuesday, August 16, 2011

cos10x+2cos^24x+6cos3xcosx=cosx+8cosxcos^3x

cos10x+2cos^24x+6cos3xcosx=cosx+8cosxcos^3x

cos10x+1+cos8x-2cosx(4cos^33x-3cos3x)-cosx=0

cos10x+1+cos8x-2cosx.cos9x-cosx=0

2cosx.cos9x-2cosx.cos9x+1-cosx=0

cosx=1

trigonometric,math-online

Posted by msconline at 1:45 PM

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Labels: trigonometric

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