Here's another: If show that the second derivative is equal to Thanks
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Originally Posted by differentiate Here's another: If show that the second derivative is equal to Thanks Impossible. Taking the first derivative will eliminate the c. How can the second derivative have a c in it?
Originally Posted by Prove It Impossible. Taking the first derivative will eliminate the c. How can the second derivative have a c in it? Because the second derivative will have an "x" in it and eliminating that reintroduces the "c". Since , . Differentiating again, . . From , and so . Then From , so .
combined with ,gives .
Originally Posted by HallsofIvy Because the second derivative will have an "x" in it
Thanks where does come from? I get that you use the product rule, but how is that equal to
Originally Posted by HallsofIvy Since , . Differentiating again, . 1st derivative... 2nd derivative... 2by is one factor and y' is the other of 2by(y'), or y and 2by' etc.
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