例6求=(x2+1)1的导数 解: _小 u ax →y=10(x2+1y(x2+1 =10(x2+1)92x 20x(x2+1)9例6 求y=(x 2+1)10的导数 解: dx du du dy dx dy = y=10(x 2+1)9 (x 2+1) =10(x 2+1)9 2x =20x(x 2+1)9