Question

I get a different answer for the Session 69 worked example (integral of sin^4(x)cos^2(x)). Only difference from MIT uploaded solution is that I have -(1/64)sin(4x) rather than -(1/32)sin(2x). I think error occurs in solution because solution work (bottom pg. 1) treats integral of cos^2(2x) as if it were integral of cos^2(x). If I'm correct in identifying this as an error, hopefully MIT can correct it on the uploaded .pdf solution so as to avoid questions about it in the future.

Answer 1

I believe you're correct in identifying an error here. Actually there are quite a few errors in the exercises. I've notified OCW of some and even prepared and submitted corrections they could use. They sent me a polite note of thanks, but months later, corrections have not been posted.

Answer 2

Thanks for your message, Creeksider. OCW is a truly wonderful site, but it's a shame that they can't spare a little time to correct errors when they are apprised of them. Correcting found errors would save so many viewers so much time. By not addressing these errors, OCW/MIT is sending the wrong message, one that essentially says that they don't care enough about us to be bothered. I've been a middle and high school math teacher for 24 years and I would never treat my own students that way.