Posted by **Mark** on Thursday, October 8, 2009 at 5:54pm.

Which of the following functions have a derivative at x=0?

I. y= absolute value(x^3-3x^2)

II y= square root(x^2+.01)- absolute value (x-1)

III y= e^x/cosx

- CALCULUS! PLEASE HELP URGENT! -
**bobpursley**, Thursday, October 8, 2009 at 6:13pm
What is your thinking? Look to see where there are discontiuties.

- CALCULUS! PLEASE HELP URGENT! -
**Mark**, Thursday, October 8, 2009 at 6:15pm
I think all three of them have derivatives because when I put them into the calculator, I saw no discontinuities. but i am debating if it's II and III.

- CALCULUS! PLEASE HELP URGENT! -
**bobpursley**, Thursday, October 8, 2009 at 6:20pm
doesn't one change slope rapidly at x=0?

- CALCULUS! PLEASE HELP URGENT! -
**Mark**, Thursday, October 8, 2009 at 6:30pm
I think it does. For answer choice one correct?

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