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As I director I would create a direct comparison between Nora and Torvald and Mrs Linde and Krogstad. There is a large amount of secrecy between both characters, however it is the contrast which sheds lig...

Its okay to not know which theorem to use immediately when you look at a question. The best way to go about it if you are struggling is to recall all the ones that you do remember and deduce any angle eve...

First we need to factorise this quadratic. This will be in the form:

0 = (Ax + B)(Cx + D)
You can work this out the values of A, B, C and D by looking at the coefficients in the unfactoris...

The electron density in the phenol ring is higher than that of the benzene ring due to the presence of the OH group. This allows the electron substitution reaction to happen without a sulphuric acid catal...

For the first part this is a standard polynomial integral whereby we can follow the power rule for anti-differentiation. In part ii), if we look at the question we see that we're trying to get I(n-1) in o...