Mathematics
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    tan arccos0.77-tan arccos0.9
    25/16=
    25*16
    20*13=
    25/13=
    25/16=
    25*16=
    236/118
    238/118=
    arccos(-0.82)
    50/4=
    50/4=
    2*3=
    55/2=
    eee
    (0.436^2*ln(0.8*11.48/47.97/0.436))/(1-0.436)^2/ln(0.2*11.48/4.074/(1-0.436))
    12.1(1+0.1)=
    2.215*2.08
    e1
    10∧(-5.5)

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