Finding the third derivative of y = cos (INX)

y'=-sin(lnx)*(lnx)'=-sin(lnx)/xy''=-[xcos(lnx)*(1/x)-sin(lnx)]/x^2=-[cos(lnx)-sin(lnx)]/x^2y''=-{[-sin(lnx)*(1/x)-cos(lnx)*(1/x)]*x^2-[cos(lnx)-sin(lnx)]*2x}/x^4=-[-xsin(lnx)-xcos(lnx)-2xcos(lnx)+2xsi...

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