







r=10cos(t) in cylindrical coordinates 
20130518 

r.m pose la question : question from calculus exam: what is the figure obtained having eqn.r=10cos(t) in cylinderical coordinates?
i know it is a cylinder with center (5,0) ,but can't the equation represent two cylinders ,one with center
(5,0) and the other with center (5,0).
thanks for any help. Penny Nom lui répond. 





Polar coordinates 
20100414 

Lan pose la question : Given the rectangular equation (x^2)+2x+(y^2)+y=0, find the polar equation. Harley Weston lui répond. 





Integration of cos (x^2+y^2) dx dy 
20100212 

anna pose la question : How do you evaluate the integration of integration of cos (x^2+y^2) dx dy? Tyler Wood lui répond. 





Three points on the circumference of a circle 
20070730 

Bharathi pose la question : given a circle with radius r and a point x,y on its circumference,output two other
points x1,y1 and x2,y2 on the circle so thar all 3 points form a equilateral triangle. Stephen La Rocque lui répond. 





Polar to Cartesian coordinates 
20060115 

Linden pose la question : How do you convert six units at 30 degrees Polar Coordinate into a Cartesian Coordinate? Penny Nom lui répond. 





A triangle in the complex plane 
20030710 

Scott pose la question : The vertices O and A of an EQUILATERAL triangle OAB in the complex plane are located at the origin and 3 + 3i. Find all possible values for the complex number representing the vertex B. Give the location of B in both polar and cartesian form (to 2.d.p) Penny Nom lui répond. 





Polar coordinates 
20000224 

Tran Trung pose la question : How do I convert r = 2/(2sin(theta)  3cos(theta)) to rectangular and x^{2} + y^{2} 2y = 0 to polar form? Harley Weston lui répond. 





A valentines project 
20000221 

Courtney Dohoney pose la question : I was assigned a valentines project. Our job is to make a valentines card that has a math theme. On my valentines card I would like to include the set of equations that when graphed look like a heart. If you can figure out a set of equations and get it back to me I would be very happy. Harley Weston lui répond. 





A Polar Plot 
19990506 

Irene pose la question : Consider the polar equation r=23Cos(theta/2) In the interval [o, 4Pi], how would you find the area of one of the leaves and also the length of one of the edges of a leaf? Harley Weston lui répond. 





Complex numbers/polar coordinates 
19990325 

Kate Cegelis pose la question : What is the relationship between complex numbers and polar coordinates? Harley Weston lui répond. 

