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" 6.Prove that "(cos6x+6cos4x+15cos2x+10...

" 6.Prove that "(cos6x+6cos4x+15cos2x+10)/(cos5x+5cos3x+10cos x)=2cos x

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y=(cos6x+6cos4x+15cos2x+10)/(cos5x+5cos3x+10cos x), the n(dy)/(dx)

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The expression (cos6x+6cos4x+15cos2x+10)/(cos5x+5cos3x+10cosx) = lambdacosx , then the value of lambda is ___________.

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