180-90-arctan(0.2*x)-arctan(0.5*x)=-180
    x*sqrt((0.2x)^2+1)*sqrt((0.5x)^2+1)=12
    12/(x*sqrt(0.04x^2+1)*sqrt((0.5x)^2+1))=1
    8*13*x^2=13^2*x^2-48*13*x+24^2+32*8
    -25/9*x^2+5/18*x-6=0
    2/5+x=0
    -25/9x^2+5/18x-6=0
    1.6x=5.6
    84.1 = 37.078ln(x) - 7.7973
    50 = 37.078ln(x) - 7.7973
    x+3/5=11/15
    x+3/5=11/15
    x+3/5=11/15
    x+3/5=11/15
    84.1 = 37.635ln(x) - 7.9579
    50 = 37.635ln(x) - 7.9579
    n^2+59n-2402
    cosx^4
    lnx/x
    5/131-0/1300-70/1650+X/126+7.8/87=0.00243(82.8+X)

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