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The key here is to realise that tanx = sinx/cosx. If we write out the left hand side of the equation in terms of sine and cosine we get: cosx/sinx + sinx/cosx These two fractions can be put over a common ...

Data Validation
Data validation is the process of comparing data with a set of rules to find out if data is reasonable. 
There are many types of data validation such as:
...

Factorising a quadratic polynomial of the form,

ax² + bx + c = 0

can be done in many depends depending on the values we have for a, b and c. 

Some s...

When it comes to unseen poetry there are many ways to approach the analysis. To begin with it is always best to read it, not once but twice, making sure to underline/note themes, imagery, sym...