atan(1/2)
    atan(1/2)
    cos22
    056-067-(466+45)
    056-067
    5^（3/5）
    1.9×0.603×312.65×(1.9×40+0.08×25/0.01)/200000
    1.1-0.65×2.39/(0.01×312.65)
    2945/(0.5×1000×700)
    592.65×〖10〗^3×(1369-536.1)/(2945×536.1)
    （0.87-0.12×（1-0）×（635/1369）^2 ）×635=
    (2945+1884)/(1000×700)
    2945/(1000×635)×360/19.1=
    701.57×〖10〗^3×816.2/(360×(635-65) )=
    (701.57×〖10〗^3×1101.2-360×1884×（635-65）)/(1×19.1×1000×〖635〗^2 )
    (701.57×〖10〗^3×1101.2-0.518×（1-0.5×0.518）×1×19.1×1000×〖635〗^2)/(360×（635-65）)
    sin40
    2^234675
    2^14-1
    2^14

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