Pythagoras' theorem and trigonometry
Last updated: 15/11/2023
Contributor: David Benjamin π
A pictorial explanation for A level students, showing Pythagoras leading to 3 related trigonometrical identities.
- sinΒ²x + cosΒ²x β‘ 1
- tanΒ²x + 1 β‘ secΒ²x
- 1 + cotΒ²x β‘ cosecΒ²x
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