Math Question
![Write the expression as the sine or cosine of an angle. \( \sin \frac{\pi}{7} \cos x+\cos \frac{\pi}{7} \sin x \)
\[
[?]\left([]+\frac{\pi}{[]}\right)
\]
Hint: \( \sin (A \pm B)=\sin A \cos B \pm \cos A \sin B \) \( \cos (A \pm B)=\cos A \cos B \mp \sin A \sin B \)](https://d3hlidq5bf9vg0.cloudfront.net/app-server-student/2021/12/12/5b8c2ffa-50e5-4218-ad38-07a1650b8705.png "Write the expression as the sine or cosine of an angle. \( \sin \frac{\pi}{7} \cos x+\cos \frac{\pi}{7} \sin x \)
\[
[?]\left([]+\frac{\pi}{[]}\right)
\]
Hint: \( \sin (A \pm B)=\sin A \cos B \pm \cos A \sin B \) \( \cos (A \pm B)=\cos A \cos B \mp \sin A \sin B \)")
Solution
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