Lesson Comments

Turkey, stuffing, cranberry sauce and pumpkin pie is what is typical, but since the US is a salad bowl of people from everywhere, variations abound...... Read more

Because I didn't know why Americans eat turkey at thanksgiving day I looked it up. Here the explanation:   In 1621 when the... Read more

Ah, I see but you left out the statement: "Here is a particular example, the derivative of the squaring function at the input 3. Let f(x) = x² be t... Read more

I think the "saved by the gong" crew should come back for a calculus course. Read more

Is this a good time to admit that I cut'n'paste this from the Wikipedia entry on calculus? I was wondering whether that most English of English fo... Read more

then the equation should read f'(x²) = ..... instead of f'(3) =..... in this case the solution to the equation would be 2x and yes at x=3 the answe... Read more

The equation isn't technically wrong, just missing information. It needs: f(x) = x² Then f'(3) = 6. Read more

I'm a bit confused by the placement of 上和下relative to the time of day indicator. Is it correct that you say 早上 (zao3 shang4) and 晚上 (wan shang) but 上午... Read more

Wow. Big respect. I love maths, even bought a "Calculus for Dummies" book for a bit of light leisure a few years back. However I was ultimately defeat... Read more

Thanks Bill, interesting, young guy too. Read more