Tính đạo hàm của các hàm số:
1.F(x)=x22xt2dxt2+1
2.G(x)=sinx2sin2x(sint2+cos2t)dt
1. Ta biến đổi:
    F(x)=02xt2dtt2+1+x20t2dtt2+1=2x0t2dtt2+1+x20t2dtt2+1
Từ đó suy ra:
    F(x)=(2x).(2x)2(2x)2+1+(x2);.(x2)2(x2)2+1=8x24x2+1+2x5x4+1
2. Ta biến đổi :
   G(x)=0sin2x(sint2+cos2t)dt+sinx20(sint2+cos2t)dt
         =sin2x0(sint2+cos2t)dt+sinx20(sint2+cos2t)dt
Từ đó suy ra:
     G(x)=(sin2x)[sin(sin2x)2+cos2(sin2x]+(sinx2)[sin(sinx2)2+cos2(sinx2)]
              =2cosxsinx[sin(sin2x)2+cos2(sin2x)]+2xcosx2[sin(sinx2)+cos(sinx2)]

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