- #1

- 326

- 1

x = t - e^t

y = t +e^-t

d^2y / dx^2 = e^-t+e^t-2 / (1-e^t)^3

I tried to do some tricks to it, but could not figure out its concavity, any help?

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- Thread starter tnutty
- Start date

- #1

- 326

- 1

x = t - e^t

y = t +e^-t

d^2y / dx^2 = e^-t+e^t-2 / (1-e^t)^3

I tried to do some tricks to it, but could not figure out its concavity, any help?

- #2

- 21

- 0

I think you found the wrong second derivative. What did you do to get that?

- #3

- 326

- 1

- #4

Mentor

- 37,238

- 9,409

Also, you need parentheses surrounding the three terms in the numerator.

Without getting too elaborate with the LaTeX coding, your equation would be improved by looking like this:

d

As it turns out, and fortunately for you, e

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