ln（sinx）ln（cosx）
    （1+X）^12=1.02
    3/(7-x)=x/sqrt(1-x^2)
    ln x/(2-x)
    4/(7-x)=x/sqrt(1-x^2)
    4/(7-x)=x
    1/x-1/2
    1.2x=0.9+x
    1.2x=0.8+x
    x=46.18/(0.95×sqrt(2×9.8×(12.21-0.98x))
    x=47.4/(0.95×sqrt(2×9.8×(12.21-0.98x))
    x=47.4/(0.95×sqrt(2×9.8×(12.21-0.98x))
    x=31.87/(0.95×sqrt(2×9.8×(12.21-0.98x))
    x=14/(0.95×sqrt(2×9.8×(12.21-0.98x))
    x=2078/(0.95×sqrt(2×9.8×(12.21-0.98x))
    x=1434/(0.95×sqrt(2×9.8×(12.21-0.98x))
    3x=10-2x
    450/x-450/（x+5）＝1
    450/1-450/（x+5）＝1
    450/x-450/x+5＝1

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