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Prove that .
Prove that $\tan^{-1}\frac{1}{2} = \frac{\pi}{4} - \frac{1}{2} \cos^{-1}\left(\frac{4}{5}\right)$.
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From ISC 2021 Specimen Mathematics Paper 1, question 7.
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From ISC 2021 Specimen Mathematics Paper 1, question 7.