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Who invented formulae of area of non right angled triangle ? What is the discriminant of x^2-6x+9=9? Determine the hybridization orbitals for C & N in C2N2? F(x)=(2x+1) is within 0.54 units of 7? Find the equation of an ellipse with center at (1,1), and vertex at (1,3), and which passes through the origin?