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How to sum an arithmetic progression?

Whilst it is very easy to just plug the numbers into the formula you are given on your formula sheet there is a much faster and more intuitive method of doing this. If we have n numbers beginning at a with a...
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Answered by Vandan P. • Maths tutor
6625 Views

What is sin(x)/x for x =0?

I'm going to show the answer to this question in two different ways. - The first is perhaps more obvious but the second is much more elegant.Taylor series expansion: Using Taylor expansion (or your trusty A ...
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45104 Views

How to find y-intercept on a graphical calculator

Your graphical calculator is your best friend. Never leave home without it, providing you're going to a class or an exam. Using graphs we can work out intercepts; solve simulatneous equations and help you ou...
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Answered by Emily H. • Maths tutor
7246 Views

How to get the most out of primary sources?

Primary sources are a key part of the historians work and will provide important points that will strengthen your argument. However primary sources are often difficult to analyse; it is impossible to not see...
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Answered by Neil W. • History tutor
4170 Views

How to gain an inverse function

Set f(x) = y. Then rearrange your equation to find x on it's own as some function of y. If you have a x term on both the top and bottom of a fraction then you will have to multiply the whole equation through...
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Answered by William S. • Maths tutor
5686 Views