1/1.62
    (0.0034*800*sin(arctan(1.9/0.0034)))/(1.9*sin(arcsin(cos37.5*sin36.5/cos270.3)+arctan(1.9/0.0034)))
    2*20000sin(2*20000)
    (0.0034*800*sin(arctan(1.9/0.0034)))/1.9
    (0.0034*800*sin(arctan(1.9/0.0034)))/(1.9*sin(arcsin(cos162*sin14.5/cos110.5)+arctan(1.9/0.0034)))
    (0.0034*800*sin(arctan(1.9/0.0034)))/(1.9*sin(arcsin(cos45*sin14.5/cos110.5)+arctan(1.9/0.0034)))
    1/2+1-2/3
    C(2,49)
    C(2.49)
    A(49,2)
    C(49,2)
    lg0.05
    √-2
    √-1
    (ln(1+1/100^2))-(1+100^2)^(1/2)+100
    1-3/7
    lg36
    1/6*6/25^2-0.04*6/25
    -arctan3
    -9÷（-84/33）

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