Question
In Exercises $7-20,$ find the exact value of each of the given expressions.$$\cos \pi \cos \frac{\pi}{3}+\sin \pi \sin \frac{\pi}{3}$$
Step 1
So, we can substitute these values into the first part of the expression: $$\cos \pi \cos \frac{\pi}{3} = -1 \cdot \frac{1}{2} = -\frac{1}{2}.$$ Show more…
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