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Enrich · Mathematics Advanced 11–12 – Year 11 · Trigonometric identities and equations

Enrich Prove the Pythagorean identity cos²⁡x + sin²⁡x = 1, and the identities 1 + tan²⁡x = sec²⁡x and 1 + cot²⁡x = cosec²⁡x

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