10lg6.544
    (1+sin47.3)/(1-sin47.3)
    sqrt(2000)
    arctan(sqrt(20))
    20lg(0.082256)
    1/9/sqrt(1.0081)/sqrt(1.81)
    180-arctan0.09-arctan0.9-90
    24^2+16^2+40*48
    log(2,1/2)+log(1/2,2)
    9^(1/3)
    sin29.0612
    cos29.0612
    arccos(0.855/(cos(180/15)))
    arctan(√2/2）
    arctan1/2
    arctan√2/2
    0.071/(4*0.0263)=
    0.111-0.04=
    0.1623^2=
    (0.1110-4%)/（4*0.1623^2）=

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