x^x=2x
    315=330cosx
    x=22cos20
    x=22cos8
    (x-2)(x+3)(x+2)-10+6+15(x-2)-4(x-3)-(x+2)=0
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.732976)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.915)
    X^3+x^2+x
    x^3-20x^2-400x=0
    (260*63*2-X)*0.9=25478.72
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=90.630
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=91.700
    7640921.70-（284002.11-（X-6407057.06）/1.09*0.09-9155.11-11.67）*1.12-2063.75=X
    7425198.85-（284002.11-（X-6407057.06）/1.09*0.09-9155.11-11.67）*1.12-2063.75=X
    （x-103.071）*20-0.63-0.63=2
    7640922.70-（284002.11-（X-6407057.06）/1.09*0.09-9155.11-11.67）*1.12-2063.75=X
    7675922.7-（284002.11-（X-6407057.06）/1.09*0.09-9155.11-11.67）*1.12-2063.75=X
    x/42+x/56+x/72=3
    7882361.62-（284002.11-（X-6407057.06）/1.09*0.09-9155.11-11.67）*1.12-2063.75=X
    2x+8/x

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