Mathematics
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    arctan0.0001
    arccos[26×cos20.562/(26+2×1×cos14)]
    arccos[26×cos20.562
    768/48
    320÷16
    800÷25
    51÷3
    240÷60
    48÷12
    178-87.21+ 43221+531921 -12.79
    15 ×(- 5)÷(- 15 )× 5
    2÷(-3/7)×4/7÷(-5 1/7)[15 1/2-114 ÷125 + 3 12 ]÷(-118 )
    (-7/18)×3/7×2.4
    (-1/6-3/20+4/5-7/12)×(-15×4)
    141550622-56202-0014-4-0150-32-04--0124
    tan(1.2)
    cos(0.75)
    1019607.84+35%*65%*1019607.84=
    160000*(1-35%)/10.2%=
    arctan5-arctan40-arctan0.05-arctan0.5-90

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