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clear, syms a c x g A>> g = exp(-a*x)*sin(c*x), int_g=int(g,x)+Ag =exp(-a*x)*sin(c*x)int_g =-c/(a^2+c^2)*exp(-a*x)*cos(c*x)-a/(a^2+c^2)*exp(-a*x)*sin(c*x)+A>>gid=simple(diff(int_g,x))gid =exp(-a*x)*sin(c*x)137