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The polymerase chain reaction (or PCR) is extremely useful at copying fragments of DNA so by the end of it you have a much bigger sample than what you started with. This is particularly useful for example...

Having to analyse an unseen passage or poem in an exam can be very daunting and it’s often tempting to panic when you first see what you’ve been given. The most important thing to do, however, is to stay ...

Although these two words can be used interchangably they are very very different. Its easier to explain if you break down their equatoins.

Speed = distance / time
V...

Sin(x), Cos(x) and Tan(x) are very useful functions and can be used to solve algerbraic problems where the aim is to find the size of an angle or a size.

Sin(x) = Opposite/Hypotenuse

Answering essay questions in exams can seem a daunting task, especially in a subject like History, but there really is no need to panic. History exams are all about preparation. There are three simple ...