2^2
    1372.86*86506=
    1098.89*94206
    785.36*112406=
    log(3,27)
    cos78
    sin78
    cos78
    acos-0.20790308
    acos-0.20790308
    arccos（-0.2079）
    1+1
    80/3+20
    (8/36)*(18/12)
    sin0.001
    csc30sin19.3775
    sin19.3775csc30
    cos49.3775
    csc20
    csc50

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