16. \( \sin x \cos x \cos 2 x \cos 4 x \) 17. \( \sin (A+B) \cdot \sin (A-B) \)
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Did you know that the product \( \sin x \cos x \cos 2x \cos 4x \) can be simplified using trigonometric identities? For example, \( \sin x \cos x \) can be rewritten as \( \frac{1}{2} \sin(2x) \), making it easier to handle in integrations or further transformations in calculations. It's like a little trigonometric party where identities make everything more manageable! When looking at \( \sin(A+B) \cdot \sin(A-B) \), this nifty identity can be rewritten using the formula: \( \frac{1}{2} [\cos(2B) - \cos(2A)] \). It showcases the beauty of trigonometric identities, turning what seems complicated into something much simpler. Just like rearranging furniture to make a small room feel more spacious!