An easy introduction to the higher treatises on the conic sections. [With] Key

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Página 19 - Find the locus of a point the sum of whose distances from two given parallel lines is equal to a given length.
Página 26 - ... the tangent of the angle which the line makes with the axis of abscissae), was lately employed by M. Crova* for the discussion of experiments relating to the degree of constancy possessed by so-called
Página 13 - ... Quadratic Equations will be learnt by the examples which we shall give in this chapter, but before we proceed to them, it is desirable that the student should be satisfied as to the way in which an expression of the form is made a perfect square. Our rule, as given in the preceding Article, is this : add the square of half the coefficient of the second term, that is, the square of - , that is, — ' We have to shew then that a' X- + OX+4 is a perfect square, whatever a may be.
Página 27 - This position of the slit is the one inclined to the axis of x, at an angle whose tangent is...
Página 21 - Thus (4) becomes (1+ m2) (x> + y2) = (a* + 62) (1 + m2), or, a2 + y2=a'2 + 62; which is the equation to a circle passing through the four points of intersection of the curves.

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