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If l(m,n)=intx^(m)cosnxdx, then prove th...

If `l_(m,n)=intx^(m)cosnxdx,` then prove that `l_(m,n)=(x^(m)sinnx)/(n)+(mx^(m-1)cosnx)/(n^(2))-(m(m-1))/(n^(2))l_(m-2,n)`

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