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    (Original post by Peanut247)
    Ah so you can't just use chain rule by itself to differentiate it... Thank you
    I was trying to do the "quick chain rule" method
    There's no "quick chain rule method"!

    You have the product of 2 functions, but the second of those functions is itself a "function of a function". So you need to use both rules to get the final answer if you want to employ those rules.

    However, as pointed out, it would be more straightforward in this case to expand the bracket and multiply things out so that you can differentiate term by term.

    If you're feeling really enthusiastic, answer the question both ways and check that your answers agree
 
 
 
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