arctan1
    log(10,0.00000000012499999646475857)
    log(10,10)
    log(10,1.2499999646475857*10^-10)
    log(10,9.999999752772727^-6)
    log(10,10^-6)
    √((69.95/1)^2+〖36.34〗^2 )
    (395.9×1000)/(0.7×10×1556)
    (59.38×1000×1000)/848776
    (59.38×1000×1000)/848776
    (59.38×1000×1000)/2178039
    √(〖35.64〗^2+3×〖50.71〗^2 )
    (395.9×1000×594918)/(193498783×2×12)
    (395.9×1000×725134)/(193498783×2×12)
    (59.38×1000×1000)/787124
    (59.38×1000×1000)/1665651
    395.9×0.15
    arccos(0.9994)
    13-（-17）+（-8）-16
    13-（-17）+（-8）-16

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