(5)y=e^[-sin2(1/x)] y'=e^[-sin2(1/x)]×[-sin2(1/x)]' =e^[-sin2(1/x)]×[-2sin(1/x)]×[cos(1/x)]×(1/x)' =e^[-sin2(1/x)]×[-sin(2/x)]×(-1/x2) =(1/x2)×sin(2/x)×e^[-sin2(1/x)] (6)y=(sinx)^n*cosnx y'=n[(sinx)^(n-1)]×(sinx)'*cosnx+(sinx)^n*(-sinnx)*n =n[(sinx)^(n-1)]*cosx*cosnx-nsinnx*(sinx)^n