-5t^2+10t=3.75
    -5t^2+10t=37.5
    -5t+10t=37.5
    25/1=38.6+49x/1.78+2x
    x^2-1/2x^2
    x^2-1/2x^2=
    x^2-1/2x^2
    1300*sin(30-x)=(2600*cos(x)-1300)/3
    (3t-32)^2+4=(40-3t)^2
    1300*sin(30-x)=(2600*cos(x)-1300)/3
    1300*sin(30-x)=(2600*cos(x)-1300)/3
    1300*sin(30-x)=(2600*cos(x)-1300)/3
    1300*sin(30-x)/2=(2600*cosx-1300)/3
    1300*sin(30-x)/2=(2600*cosx-1300)/3
    sin(30-x)*1300=(2600*cosx-1300)/3
    sin(30-x)*1300=(cosx*2600-1300)/3
    4x^2-18x+9
    x^2+x-174762=0
    n(n²＋1)＝22
    25/1=100*38.6+49x/100*1.78+2x

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