Question Detail
Question
The exact value of \(\cos 35^\circ \cos 25^\circ - \sin 35^\circ \sin 25^\circ\)
Correct Answer
Option A is the correct answer.
Detailed Explanation
(\cos A \cos B - \sin A \sin B = \cos(A+B) = \cos 60^\circ = \frac{1}{2}).
Hint
Recognize the cosine addition formula: \(\cos(A+B) = \cos A \cos B - \sin A \sin B\).