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a^2 + b^2 = c^2

This question is an example of the chain rule for differentiating. 

Firstly, identify the inner function. In this case, it is x² - 3x. This function must be differentiated firs...

As with any question involving sines and cosines, consider complex numbers as a likely way to find the answer. For this particular kind of question, where sin/cos of a multiple of x is needed in terms ...

First things first, we have to decide what type of equation this is, so we can choose how to deal with it. If it were linear (which means every term involving an 'x' has no power/superscr...

There are several different methods for solving quadratic equations. The method you use depends on the equation in question.

Usually, the easiest method is by factorising the quadratic, so...