Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 66
A. Ans. S x^ - y^ + 2ax - a^ = 0. 11. m ■ AC+nBC=k\ Ans. (m -f n) {x^ + y^) + 2 (m - n) ax + (m + n) a? -k^ = 0. 12. A - B = 0. Ans. rr^ - y^ - 2xy cot (f> - a^ = 0. 13. A straight line of variable length, OP, revolves about 0, so thatOP is equal to the product of a constant k, by the cosine of… … Fig. 58. f^ld- 59. Let P (x, y) be any point on the line. Draw the ordinatesand lis as indicated in the figures. BE PE Then by similar A, Fp ~ Tg . y2-yi_y-y^ OC — OC-i or, y-Vi ^ /y2 - yi\ ^ ?a X — x^ \x^ — xj Xi - ?/2 which may be written, ^1 ^i 1 (1) (2) Both forms should be remembered. 49 50…
Geometry, Analytic
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