You made a mistake on the second last line.
I have a function:
If I differentiate using the quotient rule, then:
let u = e^x and let v = x
But could I not express as a product ie
And then use the product rule,
Which is a different result! Why so? Or have I done it wrong?
I worked it out with a real example:
incorrect square method:
proper way - multiply top and bottom by 4
or (0.6875) CORRECT!
Well, I have learnt something. Thank you.