in fracToDiv and diffParser, first check if frac or diff occur
in fracToDiv and diffParser, first check if frac or diff occur

ChristopherChudzicki/math3d,stardust66/math3d,ChristopherChudzicki/math3d,stardust66/math3d,stardust66/math3d,stardust66/math3d,ChristopherChudzicki/math3d,ChristopherChudzicki/math3d