# general question about differentiating

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• Nov 4th 2009, 09:56 PM
purebladeknight
general question about differentiating
hi, a question asks "find the derivatives with respect to x of the following"
they are given in a form without y. e.g -3sin(3x) or 1/(3e^(3x))

can i assume them to be y= .... e.g y=-3sin(3x) when differentiating or must i state: let y=........ and then differentiate that.
• Nov 5th 2009, 03:37 AM
HallsofIvy
Use whatever form you are used to- it really doesn't matter whether you call it " $\frac{dy}{dx}$" or " $\frac{df}{dx}$" or call the function by any other name. A function by any other name differentiates as good!