Question : Evaluate the following. $\sin 25° \sin 65° – \cos 25° \cos 65°$
Option 1: 4
Option 2: 1
Option 3: 0
Option 4: 40
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Correct Answer: 0
Solution : $\sin 25° \sin 65° - \cos 25° \cos 65°$ $=\sin 25° \sin(90° - 25°) - \cos 25° \cos(90° - 25°)$ $=\sin 25° \cos 25° - \cos 25° \sin 25°$ $=0$ Hence, the correct answer is 0.
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