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∫ e^xcos x dx 

First of all, we have to think of which method we want to use to approach this problem. There are a few options we can consider such as integration by parts and su...

This is quite a difficult tense to use , but will give you extra marks if you use it fluently in your exams along with the other more regularly used tenses.

It is to be use...

It is not something you can just figure out straight away. There are tricks you can use to guess, which I will go through with you in a minute. 

It all comes down to learning your vocabul...

• down group 2 the number of protons increases therefore the nuclear charge increases (protons are found in the nucelus and have a +1 charge)

• the number of shielding electrons ...

The Polymerase Chain Reaction (PCR) is a method of DNA amplification in vitro. It consists of 3 stages - denaturation, annealing and extending. PCR relies on the use of a thermophilic Taq polymerase en...