{1-[(0.7209+0.6977)-(0.7209*0.6977)]}/(1-0.8720)
    7000*1.01^80
    cos36
    6762/13
    ln7
    99^9
    4646864616554634467664316468464616166446944*61645616484616168595616166185859416262
    4646864616554634467664316468464616166446944*2
    e5
    tan90
    sin72
    20*lg(5/(sqrt(2)*sqrt(1.0625))
    arctan3.94
    √841-9
    arctan25
    （sqrt(24)-sqrt(11/6+2sqrt(2/3))）-（sqrt(1/8)+sqrt(6)）
    （2/9）/（4/3）=
    π/2-arctan-125+arctan75
    π/2-arctan-125-arctan75
    π+arctan-125-arctan75

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