Given that
show that
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