1.6/0.8=x/0.6
    x^2+15*x=10500
    x^2-60*x=550
    -0.888889*x+44.4444=-1.16667*x-146.167
    arctan1=x
    90-arctan(4.1/5)-arctan(4.1/16)
    90-arctan(4.2/5)-arctan(4.2/16)
    90-arctan(4.9/5)-arctan(4.9/16)
    90-arctan(4.5/5)-arctan(4.5/16)
    90-arctan(4/5)-arctan(4/16)
    90-arctan(5/5)-arctan(5/16)
    1/305.15-8.315*lnx/80869.69=1/321.35-8.315*ln(1-x)/51598.701
    -arctan0.1*x-arctan0.2*x=-90
    tanx=1
    arctanx=1
    20/(x*sqrt(1+x^2))=1
    90+arctan(27/7.217)-arctan(27/101)-arctan(27/5)-arctan(27/16)
    X^(2)－3.135X－0.594=0
    x^4-34*x^2+225=0
    0.05213*0.05196/0.111=x*0.05213+(0.8-x)*0.05196

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