Studying for my maths unit for my part 66 license and my example question has a bit that is massively confusing me and I hope someone with better maths skills than me can help [so that when i do my exam i have a chance of getting this right]
The question is this:
And the first part of the given solution is:
Rearrange intergrand into form
However the example doesnt explain how that rearannged part is obtained and I've been staring at it for the last 2 hours trying to work out how
Can anyone explain [preferably idiot-proof] how this rearranging bit works?