Please help a returning mature student...
Help needed with 2 Differentiation Questions.
Q= 2e^x + e^-2x
A= 2e^x + -2e^-2x
Why would they keep 2e^x in the answer ?
I do understand the -2e^-2x part though managed to work that one out correctly..
Q= sin(-8Q) the Q is supposed to be theta dont know how to write it on keyboard.
A= I would tend to give -8 Cos -8Q but the actual answer is
-8Cos(-8Q)=-8Cos 8Q. So I dont understand how they come to that please help.
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Maths Diff Question confusion Pls help watch
- Thread Starter
- 23-09-2010 23:05
- 23-09-2010 23:35
First one: why not? e^x differentiates to e^x, so 2e^x differentiates to 2e^x.
Second one: cos is an even function, i.e. cos(-x) = cos x (so in this case, cos(-8Q) = cos(8Q)