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The first thing you must remember is to NOT PANIC whilst looking through past paper questions as it will seem there are a few hard words and structures that you may not have covered in your lessons...

An inequality is a difference in access to resources leading to social, economic, cultural advantages and disadvantages. Economic inequalities can cause and reinforce social inequalities.

The econo...

The first step to solving this is equation is to notice that the equation is of a similar to the form of a quadratic equation: ay^2 + by + c  = 0 where a, b and c are constants. Next we introduce a new va...

Let u = x²+4x+2 so y = ln(u).

Then dy/du = 1/u and du/dx = 2x+4.

Using the chain rule we have:

dy/dx = (dy/du)*(du/dx)

= (1/u)*(2x+4)

= (2x+4)/(x²+...

The first stage is lexical analysis which takes the source code as an input and: • Removes whitespace and comments; • Converts remaining code into tokens, by breaking down the code by recognising reserved...