This is my take on the question:
But the answer given was
Can you tell me where I have gone wrong? Thanks.
Good night(or morning or afternoon, depending on your location)
If I understand your work correctly, then this is your mistake
By doing this, you change the expression completely.
What you should have done is multiply the numerator and denominator by , which is effectively multiplying by .
To see it in action
And there you have it
Hmm...okay but what I actually did was this:
I equated the denominator of the numerator of the above to to become
then, simplifying them, I get
Is it against the math logic if I equate the denominator of the fractions in the numerator of the expression?