Find-exact-form-of-cos-tan-1-1-2-

Question Number 20198 by Joel577 last updated on 24/Aug/17

Find exact form of

\cos (\tan^{- 1} (\frac{1}{2}))

Answered by Tinkutara last updated on 24/Aug/17

\tan^{- 1} (\frac{1}{2}) = \cos^{- 1} (\frac{2}{\sqrt{5}})

∴ \cos (\cos^{- 1} (\frac{2}{\sqrt{5}})) = \frac{2}{\sqrt{5}}

Commented by Joel577 last updated on 24/Aug/17

t h a n k y o u v e r y m u c h

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