arctan((5*12)/(47+3*22+5*(12/tan70)))
    (5*12)/(47+3*22+5*（12/tan70）)
    0.231*0.8*75*0.001*(180-67)
    2*5*6*9*9
    arctan2.105263
    arctan(12/5.7)
    sqrt8444
    0.90×2×14.9
    11.49 + 20.5 + 14.9
     8.36 + 3 + 1/7.605
    (1.98/tan35)*2
    1/cos(0.001328323)-1
    (3/12.8)
    tan0.01-0.01
    sin0.01
    sqrt(0.0021083904703515625)
    59/(1+0.1)+59/(1+0.1)^2+59/(1+0.1)^3+59/(1+0.1)^4+(1250+59)/(1+0.1)^5=
    6.75 + 2.16
    6.36 + 2.16
    0.5*75

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