I don't understand why the -xy transform to -r^2*cos^2(theta)*sin(theta). Since I think x=rcos(theta), y=rsin(theta), -xy should be equal to -r^2*cos(theta)*sin(theta). where does cos squared come from?
I don't understand why the -xy transform to -r^2*cos^2(theta)*sin(theta). Since I think x=rcos(theta), y=rsin(theta), -xy should be equal to -r^2*cos(theta)*sin(theta). where does cos squared come from?
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
Section: Chapter Questions
Problem 12T
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I don't understand why the -xy transform to -r^2*cos^2(theta)*sin(theta). Since I think x=rcos(theta), y=rsin(theta), -xy should be equal to -r^2*cos(theta)*sin(theta). where does cos squared come from?
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