2015_II_6_Pure

Stuck on (iii) at the moment

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:red_circle::red_circle::red_circle::red_circle: @Riemannintegral :red_circle::red_circle::red_circle::red_circle:

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@Riemannintegral this is impressive. Can I ask how you intuit part (iii). Is it practice / intuition around the previously mentioned u = pi - x substitution / something else

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I just used the previous substitution. I also tried reversing a quotient rule derivative but that didn’t arrive at an answer. I’ve been doing step questions for 2 years now and typically make progress by following hints from previous parts of the question.

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Very helpful, thank you

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