# Math Help - general question about differentiating

1. ## 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.

2. 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!