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2*x*tan(x)+x^2*(1/((cos(x))^2))
5*abs(x)+6 = 0;x
x
y = 5.51*x-2.95*x^2-31.37;-2.95;5.51;-31.37
-((5.51^2-(-31.37*(-2.95)*4))/(-2.95*4))
-(5.51/(-2.95*2))
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