例1:f12*x2+3*x-5:g三x个24x-7 h= symadd(f, g 3*x个2+4米x-12 例2:fos(x)g=sin(2*x symp( ",g 4, f, *t, g) ans cos(/sin(2*x)+cos(x)*sin(2*例1：f= '2*x^2+3*x-5'; g= 'x^2+x-7'; h= symadd(f,g) h= 3*x^2+4*x-12 例2：f='cos(x)';g= ' sin(2*x)'; symop(f,'/',g,'+',f,'*',g) ans = cos(x)/sin(2*x)+cos(x)*sin(2*x)