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    (tan(arccos0.64)-tan(arccos0.9))
    tan(arccos0.63)
    1.25*7
    2*sin57.5052
    arctan1.57
    -2×(-1)
    1.25*7
    e^0.03
    e^0.00003
    1.25*7
    √(〖(23.8-1.5)〗^2+13^2 )
    1000/340*1000
    π×1.4×(8.36×1.3/2+22×9.5/2+1.5×5.8/2+4.5×6/2+53×1.3/5)
    π×1.4×10(8.36×1.3/2+22×9.5/2+1.5×5.8/2+4.5×6/2+53×1.3/5)
    3521+2866.7
    407.2+383.2+407.2+392.2+503.2+447.2+287.2+119.2+287.2+287.2
    159.2+220.2+169.2+144.2+144.2+144.2+194.2+119.2+119.2+199.2+119.2+119.2+119.2+368.9+527.2
    π×1.4×10(1×8.36+1.5×9.5+1.5×5.8+4.5×1.3+1.7×1.3)
    1/2×[1.4×π×(8.71×15+10.1×30+15×5.9+4.5×30+0.9×70)]
    1/2×[1.4×π×(8.36×15+9.5×30+5.8×15+4.5×30+1.3×70)]

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