Let , where . Then
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Originally Posted by polymerase Let , where . Then As a start, . So now you need to differentiate with respect to x, where you know the rule for f ........
Originally Posted by mr fantastic As a start, . So now you need to differentiate with respect to x, where you know the rule for f ........ what do you do now?
Originally Posted by polymerase what do you do now? Indeed, what do you do now? At the risk of sounding arrogant, I would have thought it was reasonably obvious that now you get expressions for f(2x) and f(3x) using the given rule . Then you construct the expression 2f(2x) - 3f(3x). Then you differentiate it.
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