My Message to Mr. Khan of KhanAcademy

Unable to hold my silence any longer! This is the feather that broke the camel's back.

Polar Coordinates 1

http://www.youtube.com/watch?v=jexMSlSDubM


Jane's Comment:

Dear Mr. Khan, the reason I stopped by is because someone asked me to make tutorials on Polar Coordinates. You must know that the polar point (5, 53.13°) is only close to the Cartesian point (3, 4). Those two points are NOT EQUAL. Rover would have never reached Mars. I have restrained from writing for a long time. Math cannot be sloppy. Do not mean to offend. But students must learn properly.

P.S. Your sine double angle proof would turn off anyone going into math.