dy=d{e^[-sin^2(1/x)]} =e^[-sin^2(1/x)]*[-2sin(1/x)]*cos(1/x)*(-1/x²)dx =e^[-sin^2(1/x)]2sin(1/x)cos(1/x)*(1/x²)dx=e^[-sin^2(1/x)] *sin(2/x) *(1/x²)dx