| Exam Board | OCR MEI |
| Module | Paper 3 (Paper 3) |
| Year | 2021 |
| Session | November |
| Topic | Addition & Double Angle Formulae |
15 Prove that \(\arctan 1 + \arctan 2 + \arctan 3 = \pi\), as given in line 41 .
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\section*{OCR
Oxford Cambridge and RSA}