求不定积分∫(ln3x-2sinx)dx ∫(ln3x-2sinx)dx >> syms x yy=log(3*x)-2*sin(x);int(y)ans =2*cos(x) - x + x*log(3*x)定积分∫_0^1(x^2+1)arccosxd ∫_0^1(x^2+1)arccosxd >> syms x yy=(x^2+1)*acos( ) ...