Mathematics
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    (-3)^2*2【-2/3+(-5/9)】-(-6)/4
    1802.42*(1+4.5%)^4
    tan45
    C(3,6)
    C(2,6)
    C(1,6)
    C(3,11)
    1/9899
    0.6875/0.875
    0.875/0.6875
    5.28+12.5*4.12*0.8+4.72
    0.8*4.6
    8*4.6
    0.8*(13-8.4)
    -2cos5×cos10×cos15
    cos5
    5/6×12
    √{[(2/5×√3)-(-3/5×√3)]^2-(3-1)^2}
    2cos(2π-π/3)
    2cos(2π-π/3)

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