arctan0.133333333333π
    arctan0.1333333π
    arctan2π÷5
    800000*(1+0.007974)^-12 =
    arctan2π/120
    6000000*(1+0.008652)^-12=
    arctan2π/50
    arctan2π/15
    arctan(106/131)+arctan(106/81)
    arctan(92/117)+arctan(92/67)
    25(1+0.7cos(54.3)-0.3cos(108.6))
    arccos(0.6
    cos(54.3)
    arctan(120/115)+arctan(120/65)
    arctan(66/(-0.2*88+1))-arctan(66/(-0.02*88+1))-arctan(-90*1.732/65)-arctan(-90*1.732/115)
    -0.9^-0.9
    4*4*16+4*8*8*2-8*8*4*2-16*16
    cos(67)/cos(22)*150
    cos(22)/cos(67)*150
    180+arctan(-90*1.732/65)+180+arctan(-90*1.732/115)

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