25×(200+4) 309+102÷(42-25) 420÷[15×(43-39)] 12×(324－285)÷26
    arctan10-arctan(0.6/0.008)-arctan0.6-arctan(0.6/4)
    (520 + 480)÷50×4 40-(35-27+6) 360÷(70－4×16) [(127+149)÷3]×2
    120+(64÷16)×5 (142-106)÷12×26 (187-87)×15÷3 350×[420÷(76-16)]
    arctan0.6+arctan(0.6/4)=
    arctan0.6-arctan(0.6/4)=
    544-(262+66)-148 25×(4+8)×125 210-（62÷31)×4 (121-85)÷12×26
    (624＋12×18)÷28 25×22－280÷35 275+25×(400-291) 85×(95-1440÷24)
    980÷[14×(71－66)] 45＋55×(90－34) 7×(9+12)÷3-2 7×[9+12÷(3-2)]
    (315×40-364)÷7 720÷(15-3×2) 5000÷[(432-332)×2] (624＋12×18)÷28
    (89+67)÷4 52×(432÷9) 6×[1000÷(59+66)] 5940÷45×(700-616)
    5×(25+14) (80-15)÷5 250÷[(14-9)×2] 85×(5-5)×5
    arctan2.24-arctan(2.24*0.25)
    arctan2.24-arctan(2.24*0.25)+90
    -33.339895+90
    arctan(7.5/2.8)-arctan7.5-arctan(7.5/20.1)
    -31.654916+90
    arctan(7.5/2.67)-arctan7.5-arctan(7.5/21)
    20(lg2.67-lg7.9)
    arctan4.47

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