(4175600x-419619600)*754.3/730＝3203200x-2860xx
    -2860xx-972400x+419619600＝0
    (-4*sin(x)^2)-sin(x)+4*cos(x)^2-cos(x) = 0
    3.14159 26 ／x = 0.607688
    5400/x*30=200
    3.1415926／x = 0.607688
    (-4*sin(x)^2)-sin(x)+4*cos(x)^2-cos(x)
    (-4*sin(x)^2)-sin(x)+4*cos(x)^2-cos(x)
    (-4*sin(x)^2)-sin(x)+4*cos(x)^2-cos(x)
    (-4*sin(x)^2)-sin(x)+4*cos(x)^2-cos(x)
    (-4*sin(x)^2)-sin(x)+4*cos(x)^2-cos(x)
    (-4*sin(x)^2)-sin(x)+4*cos(x)^2-cos(x)
    400×(1－x)^2＝256
    12*a+5/(2^0.5)*(a^(5/2))-126=0
    4X=X+32
    4X-X=32
    4x+2=7-x
    12x+6=21-3x
    (x/5+x^2)*sqrt(5+x^2)=sqrt(2)x/4
    920Q-50Q-630Q-1520=880

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