f(x)=∫ sint/t dtf'(x)=d/dx ∫ sint/t dt=d/dx [Si(x³)-Si(1)],令u=x³,u'=3x²=sin(u)/u·(u)'-0=3x²·sin(u)/u=3x²·sin(x³)/x³=3sin(x³)/xSi(x)是正弦函数,Si(x)=∫(sin...