Posted by Mark on .
Which of the following functions have a derivative at x=0?
I. y= absolute value(x^33x^2)
II y= square root(x^2+.01) absolute value (x1)
III y= e^x/cosx

CALCULUS! PLEASE HELP URGENT! 
bobpursley,
What is your thinking? Look to see where there are discontiuties.

CALCULUS! PLEASE HELP URGENT! 
Mark,
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,
doesn't one change slope rapidly at x=0?

CALCULUS! PLEASE HELP URGENT! 
Mark,
I think it does. For answer choice one correct?