1.2×（1.17）+1.4×（4.32）
    (0.677×4.06×600^4)/(100×（2.06×10^5）×121867)
    25*7
    cos43
    5092+0.325*（100945-45000）=
    2200*(200%/3)*(108/365)*90%=
    32+4.9-0.9
    51.05-38.90
    18+40.5/2+38.4/3
    √2-3
    sin617.01
    sin6177.01
    sin196.5
    sin（196.5π）
    cos196
    cos196π
    (8^2 + 15) /2
    sin617
    sin196.5π
    sin196.5π

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