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Evaluate each of the following:

cos60° cos45° - sin60° sin 45°

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cos60° cos45° - sin60° sin 45°

\(\frac{1}2\) x \(\frac{1}{\sqrt{2}}\) - \(\frac{\sqrt3}2\) x \(\frac{1}{\sqrt{2}}\)

\(\frac{1-\sqrt3}{2\sqrt2}\)

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