sincotx+coscotx=sqrt2 log(3,cscx)=3
    cotx^2+2cotx-3=0
    sinx^2+cosx^2=1 x+sqrt(x^2+1)=0
    sinx^2-cosx^2=sinx^4-cosx^4 x^2+1=0
    4X^2+4X-35=0
    x∧2-x-1＝0
    x∧2-x+1＝0
    x2-x-1＝0
    x（x+6）＝9
    x（x-6）＝9
    8100（x+26）=9900x
    4x-3（40-x）=62
    x^2*sin1/x
    （(2093+289+185-121-136-104-X-6140)/6140)*0.5=((1845+X)-3716)/3716
    （(2093+289+185+67-X-6140)/6140)*0.5=((1845+X)-3716)/3716
    x^3-6*x^2-87*x-160
    63*x*x-140x+60=0
    0.5s^2+1.5s+1
    3270=V+0.0305V+577+17.31+130.8+0.0319V+11.15+172.98+87.01
    [（X-180）*(1-0.25)]/1610=[(X-170)*(1-0.25）-258.8]/1210

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