Example 11.1B Show sin r is continuous. Proof. Represent r as the arclength AP, so the point P is (cos x, sin x). Since the perpendicular PR is the shortest distance from P to the horizontal, we see that 0 x-x' X-X0 Po |PR| < \PPo], i.e., | sin r – sin rol < lx – xo] · A (3)
Example 11.1B Show sin r is continuous. Proof. Represent r as the arclength AP, so the point P is (cos x, sin x). Since the perpendicular PR is the shortest distance from P to the horizontal, we see that 0 x-x' X-X0 Po |PR| < \PPo], i.e., | sin r – sin rol < lx – xo] · A (3)
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.3: The Addition And Subtraction Formulas
Problem 80E
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