Elements of the Integral Calculus : With a Key to the Solution of Differential Equations
The book Elements of the Integral Calculus : With a Key to the Solution of Differential Equations was written by author Byerly, William Elwood, B. 1849 Here you can read free online of Elements of the Integral Calculus : With a Key to the Solution of Differential Equations book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Elements of the Integral Calculus : With a Key to the Solution of Differential Equations a good or bad book?
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(3) Jo Joz For, in the second one, which agrees best with the figure, we must take our limits so that the limit of the sum of the projec- tions may be the quadi-ant in which the sphere is cut by the Chap. XI.] AEEAS OF SURFACES. 125 plane XZ ; and the equation of this section is obtained hj letting 2/ = in the equation of the sphere, and is whence z = Va^ — af. If we take as our limits in the integral ( - clz zero and -s/ar— x^ ^ y we shall get the area whose projection is a strip running from ...the axis of Z to the curve ; then, taking j ( j - f^ ) f?^ from to a, we shall get the area whose projection is the sum of all these strips, and that is om- required surface. y = Va^_a;2. (T=al I — Jo Jo Va^ -x'-z^ f clz Vci^ — 3Cp — = sin"-^ - Vcr — af if we regard x as constant ; c7o- >/rt2-a;2 dz cr — a \ -ax = — , Jo 2 2 the required area. Formulas (1) and (3) give the same result. 133. Suppose two cylinders of revolution drawn tangent to each other, and perpendicular to the plane of a great circle of a sphere, each having the radius of the great circle as a diameter ; required the surface of the sphere not included by the cylinders.
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