150/3.6*sin(5) - 9.8 * t = 0
    150/3.6*cos(5) *t = 57
    1/2*150/3.6*t=265
    x^4-6*x^2+8*x+7=0
     v*0.54- 1/2* 9.8 *{ 0.54 }^{ 2 } = 11
    lgx=0.265
    x²-0.71x+0.0169=0
    （2+x）²=（4-x）²+2²
    4+2X+X²=16-8X-X²+4
    37.8x^2+37.8x^4=400
    37.8x^2+37.8x^4=20
    400=x^2+x^4
    14.44x^2+14.44x^4=20
    x/(e^2)=0.25ln(x)^2
    x/e^2=0.25ln(x)^2
    a×0.6=56.9
    x/e^2=1/4ln(x)^2
    x/e=lnx
    x＾3sinx＋x＾2cosx＋500=0
    x＾3sinx=0

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