AIR MATH

Math Question

Write the expression as the sine or cosine of an angle. \( \cos 7 y \cos 3 y-\sin 7 y \sin 3 y \)
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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