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Practise writing maths in LaTeX
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With the [ ] → { } switch on, the bracket keys type curly braces without Shift. Use Shift+[ when you need a real square bracket, e.g. \sqrt[3]{x}.
It doesn't matter how you space things, whether you write x^{2} or x^2, or whether you use \left( \right). It only has to look the same.

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