53/44.42
    1/(1/10+1/20+1/29)
    2.5^2*3.14*82
    2.5^2*3.14
    2.5^2
    1/(2*3.14*(81*5.9)^(1/2))
    25/π
    1/(1/28.7+1/30)
    1/(1/42+1/91)
    46.6/151
    10.4*3.99
    1/(1/72+1/5+1/27)
    1/(1/22+1/55+1/31)
    tan200
    -arctan(3)-arctan(1.5)
    16/(64/9)+(-9/2)*(1/3)
    atan-0.618
    atan-6.18
    ln(0.99)-(0.99-1)/(0.99+1)
    (3709.82*ln(5.71*30.1))/((9.42478/4/0.178)^0.5-1.64)/30.1

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