arctan（-√6）
    arctan（√6）
    1÷89875517873681764
    299792458*299792458
    800000×6％×2÷12
    1000000×4％×3÷12
    300/0.3
    300/.03
    300/.04
    300/0.3
    arcsin0.73835
    arcsin0.7383502636415
    sin0.7383502636415
    arcsin0.800103
    arcsin0.800163
    3/4+3/4^2+3/4^3
    50%*96%=
    4sqrt(4)
    （1200+1080.25）*0.066*3/12
    2794.94*0.06*3/12

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