Math Question
![Find the exact value using a sum or difference identity.
\[
\begin{array}{l}
\cos 105^{\circ} \\
\frac{\sqrt{2}-\sqrt{[?]}}{[]}
\end{array}
\]
Hint: \( \sin (A \pm B)=\sin A \cos B \pm \cos A \sin B \) \( \cos (A \pm B)=\cos A \cos B \mp \sin A \sin B \)
Enter](https://d3hlidq5bf9vg0.cloudfront.net/app-server-student/2022/4/3/afc2d21d-fc1e-46ba-984f-581869854294.png "Find the exact value using a sum or difference identity.
\[
\begin{array}{l}
\cos 105^{\circ} \\
\frac{\sqrt{2}-\sqrt{[?]}}{[]}
\end{array}
\]
Hint: \( \sin (A \pm B)=\sin A \cos B \pm \cos A \sin B \) \( \cos (A \pm B)=\cos A \cos B \mp \sin A \sin B \)
Enter")
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