sin(π/4)
    20×16/15
    8*6.5+5*12+3*5
    tan(2.3311/2)
    tan89.358839
    tan1.570796
    (1/3)^-3+log(2,1/8)+(3/4)^0
    (25×2.5)/(cos13)
    (69×2.5)/(cos13)
    √((2×2.15×247.386×1000)/(1×64.149^3 )×(3.21+ 1)/( 3.21))×2.46×189.8×0.713×0.987
    1.25×7712.856/64.149
    2×1000×247.386/64.149
    √(cos13)
    √((4-1.647)/3 (1-1.553)+1.553/1.647)
    acos((69×cos20.483)/(69+2×1×cos13))
    acos((25×cos20.483)/(25+2×1×cos13))
    arctan((tan20)/(cos13))
    arctan(tan20)/(cos13)
    acos0.974376
    1.1771*1.7939

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