By H.-D. Doebner, S. I. Andersson, H. R. Petry

Lecture notes in arithmetic No.905

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571. 58 y = sin x and y = cos x. 58. We must always know that, except at the points of tangency, the graphs lie between the lines having the equations y = -1 and y = 1. Moreover, 7 is a little bit greater than 3, and this must be fully recognized when the graphs are sketched. When we want to sketch the graphs, the first step is to draw guide lines one unit above and one unit below the x axis. The next step is to hop three units and a bit more to the right of the origin to mark a, and make another such hop to mark 2a.

The symbol [x] represents, when we are properly warned, the greatest integer in x, that is, the greatest integer n for which n < x. 01] = -4, and [2] = 2. 571. 58 y = sin x and y = cos x. 58. We must always know that, except at the points of tangency, the graphs lie between the lines having the equations y = -1 and y = 1. Moreover, 7 is a little bit greater than 3, and this must be fully recognized when the graphs are sketched. When we want to sketch the graphs, the first step is to draw guide lines one unit above and one unit below the x axis.

This is therefore the equation of the circle with center at (h,k) and radius a. 45) x2 + y2 = a2 is the equation of the circle with center at the origin and radius a. 451) (x + 2)2 + (y - 3)2 = 25. Analytic geometry in two dimensions 26 When the parentheses are removed and the constant terms are collected, this equation takes the less informative form x2 + y2 + 4x - 6y - 12 = 0. 453) x2+y2+Dx+Ey+F=O, where D, E, and F are constants. 453) is the equation of a circle. 454) (x2 + Dx + ) + (y2 + Ey + ) = -F.