Pythagoras' theorem and trigonometry
Last updated: 15/11/2023
Contributor: David Benjamin 🐝
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A pictorial explanation for A level students, showing Pythagoras leading to 3 related trigonometrical identities.
- sin²x + cos²x ≡ 1
- tan²x + 1 ≡ sec²x
- 1 + cot²x ≡ cosec²x
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