A-Level Maths: E1-03 [Trigonometry: Using the Two Triangles]

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Why are these the side lengths you have to learn? Is it for ratio's sake (because they give nice exact values)?

eloisepearce
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Do you have to learn the triangles, even if you know the values without them? For example, could a question in the exam specifically require you to use these triangles?

jamminermit
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All the A level maths papers are calculator though so do we need to know this- unless would it come useful for STEP?

brevlol