Reverse Chain Rule (OCR A Level Maths A) : Revision Note
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Reverse Chain Rule
What is the chain rule?
The Chain Rule is a way of differentiating two (or more) functions

In many simple cases the above formula/substitution is not needed

The same can apply for the reverse – integration
Integrating with reverse chain rule

In more awkward cases it can help to write the numbers in before integrating
STEP 1: Spot the ‘main’ function
STEP 2: ‘Adjust’ and ‘compensate’ any numbers/constants required in the integral
STEP 3: Integrate and simplify


Examiner Tips and Tricks
If in doubt you can always use a substitution.
Differentiation is easier than integration so if stuck try the opposite, eg. sin and cos are linked (remember that minus!) so if integrating a sin function, start by differentiating the corresponding cos function.
Lastly, check your final answer by differentiating it.
Worked Example




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