50*sin(x)/sin(36)=20/sin(x+36)
    1-2x=0.125*(2-x)
    0x=2
    10cosx-10cosx(cosx+sqrt((cosx)^2+2sinx+11/5))=10
    10cosx-10cosx(cosx+sqrt((cosx)^2+2sinx+11/5))=0
    10cosx-10sinx*(10cosx+sqrt(100*(cosx)^2-240-200sinx))/10=0
    10cosx-10sinx*(10cosx+sqrt(100*(cosx)^2-240-200sinx))/10=20
    i^2024
    sincotx-cos2=0
    1/cosx^2-tanx^2=1
    1/cosx^2-tanx^2=1
    21x^2-85x+84=0 21x^2-13x-84<=0 7536*24987 sin2tan2-cos2cot2 751/2731-5386/9973 774144 1,1,2,3,5,8,13,21,34,55
    （1606-X）/X=0.55
    x^2-50x+600=0
    0.5=2/3*2x/(2x+1)
    0.5=x
    7600/（x+26.88)+10000/(x+13.44+22.4)+10000/(x+13.44)=150
    X^3+56*X^2=531
    256*x*x+100*x*x=40.6*40.6
    X^3+56*X^2=531

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