Linkfest for Wednesday, February 19

• This derivative plotter will come in handy in Calc I,
• The case for student-invented strategies (I found this blog while working on MTAP),
• Sam is doodling in math class (I need to play with this! When will I have time?)
• Dave Richeson has collected a list of math blogs by undergrads,
• I'm teaching parametric and polar stuff in calc II right now, and have been thinking about drawing a straight line in polar. I liked this article and I've already forgotten who kindly sent me this desmos work,
• I'll be teaching derivatives of trig functions in Calc I over the next few days, and want to connect it to sound waves, reading up on that here.