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7. Maths Radians

Radians are the hidden core behind trigonometry and can be a little tricky to understand at first. But once you get the hang of it, you will never want to go back to measuring angles in degrees.

6. Maths Trigonometry

Trigonometry is one of those things that makes people run for the hills, but once you understand it, you won't know how you ever lived without it.