I have not done differential calculus for awhile. I reviewed my calc book, but I am still having some trouble. Could someone please check these derivatives?

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- January 16th 2011, 11:58 AMsedemihcraCheck derivtives for correctness
I have not done differential calculus for awhile. I reviewed my calc book, but I am still having some trouble. Could someone please check these derivatives?

- January 16th 2011, 12:00 PMdwsmith
- January 16th 2011, 12:04 PMAlso sprach Zarathustra
The first one:

(2^{-x} )'=-ln(2)2^{-x}

The third one is correct. - January 16th 2011, 12:05 PMHallsofIvy
[QUOTE=sedemihcra;606004]I have not done differential calculus for awhile. I reviewed my calc book, but I am still having some trouble. Could someone please check these derivatives?

The second term should be because of the - in the numerator.

By the way, the it is simpler to get using "braces": "2^{-x}" rather than "2^-^x".

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- January 16th 2011, 12:05 PMdwsmith
- January 16th 2011, 12:09 PMsedemihcra
Thanks for all the help. Also thanks for getting back so quick.