Just been thinking, is this method correct?
multiply both sides by
This exact question was posted yesterday here : http://www.mathhelpforum.com/math-he...-identity.html
Well than they must be using the same excercise book as me, as my exam board is with edexcel, this is the book I am using!
Edexcel AS and A Level Modular Mathematics - Core Mathematics 3: Amazon.co.uk: Mr Keith Pledger: Books
No, you are given that , from which you must deduce that .
You cannot use in your proof that because that is what you are trying to show. However that is what you seem to be doing in the third line : starting from , you replaced by .