Mathematics
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    tan(arccos0.81)
    tan(arccos0.66)
    tan(arccos0.93)
    tan(arccos0.67)
    280×3
    280-280/3
    800/1000*0.5391+200/1000*0.3750
    1-(50/200)^2-(0/200)^2-(150/200)^2
    1-(450/800)^2-(300/800)^2-(50/800)^2
    arctan0.5*2
    650/1000*0.6036+350/1000*0.6122
    1-(150/350)^2-(150/350)^2-(50/350)^2
    1-(350/650)^2-(150/650)^2-(150/650)^2
    500/1000*0.3200+500/1000*0.5600
    1-(100/500)^2-(300/500)^2-(100/500)^2
    1-(400/500)^2-(0/500)^2-(100/500)^2
    1 3( 1) 8
    19.5/6×[(5.9+2.187)^3×0.27-3.69×2.187^3]=
    0.3252/0.7219
    0.0312/0.9341

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