Plane and solid analytic geometry; an elementary textbook (1901)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's sons · leaf 24
es and the cosines of the angles of atriangle are often stated in trigonometry without regardto the direction of the sides ofthe triangle. But for our workthese must be stated in a moreaccurate form. Let the posi-tive direction of each side ofthe triangle ABO be fixed. Itcan be easily shown that… … 6 ANALYTIC GEOMETRY [Ch. I, § 8 8. The quadratic equation. —We shall have occasion touse a few theorems in quadratic equations which it seemsadvisable to reproduce here. Any quadratic equation may be written in the form ax2 + bx + e = 0. The two roots of this equation are _ h + V62 - 4-<w , - b…
Geometry, Analytic
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