- cos-cos-1-17 -sin-1-17 - -

. cos{cos^ 1( 17 )+sin^ 1( 17 ) }= cosπ2=0 . ...

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Trigonometric Functions

. cos[cos-1-1...

Question

$cos [{cos}^{- 1} (\frac{- 1}{7}) + {sin}^{- 1} (\frac{- 1}{7})] =$

\begin{matrix} \frac{- 1}{3} \end{matrix}

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\begin{matrix} \frac{1}{3} \end{matrix}

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\begin{matrix} \frac{4}{9} \end{matrix}

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