tanx-x=0.018
    136=5/sin(x/(2*7))+(5/sin((π-2*x)/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin((π-2*x)/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin((π-2*x)/2*7)-5/sin(x/(2*7)))cosx
    5/sin(x/(2*7))+(5/sin(π-2*x/(2*7))-5/sin(x/(2*7)))cosx=136
    136=5/sin(x/(2*7))+(5/sin(π-2*x/(2*7))-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin(π-2*x/(2*7))-5/sin(x/(2*7)))cosx
    x+1=2
    x+1=2
    π*(D^2-74^2)=2000000*4*0.042
    x3-3x2+5x＝0
    (1+0.3)^4*80= x
    (1+0.3)^4=x
    (1+x)^4=2.8
    tanx-x=0.018
    tanx-x=0.018
    tanx-x=0.018
    x^3
     160+5.48x^2-4.02x-91.52-71.88
    160+5.48x^2-4.02x-91.25-71.88

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