[질문] 무리수미분법좀알려주세요

실수r에수렴하는유리수열{Rn}이있다하자.즉limRn=r,limTn=t참고)lim밑에n가무한대접근기호가있습니다.y=x^r=limx^Rn,dy/dx=limRn*x^(Rn-1)=r*x^(r-1)-QED-