第一问dy/dx=-6xsec^2(2-3x^2) · 2tan(2-3x^2)则dy=-12xsec^2(2-3x^2)tan(2-3x^2)dx第二问dy/dx=1/{[3x/(1-x²)]²+1}(-x²+6x+3)/(x^4-2x^2+1)则dy=dx/{[3x/(1-x²)]²+1}(-x²+6x+3)/(x^...