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    tanarccos0.60-tanarccos0.95
    tanarccos0.77-tanarccos0.93
    420×tanarccos0.77-tanarccos0.93
    275.11×tanarccos0.60-tanarccos0.95
    √2/√5
    10×4/1
    271234.788/17.64
    0.293×12×77143
    0.83/(2+0.83)=
    (34615+34615+29630+29630)/(2×77143)=
    170331.744/17.64=
    0.184×12×77143
    0.45/(2+0.45)=
    (34615+34615)/(2×77143)=
    33.9^6-282636.3872×33.9^4+739898611.1×33.9^2-478853785000
    20lg110
    274011.936/17.64
    0.296×12×77143
    0.84/(2+0.84)=
    (34615+36000+29630+29630)/(2×77143)=

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