Question
Exer. $5-10:$ Find the exact values.(a) $\cos \frac{\pi}{4}+\cos \frac{\pi}{6}$b) $\cos \frac{5 \pi}{12}\left(\text { use } \frac{5 \pi}{12}=\frac{\pi}{4}+\frac{\pi}{6}\right)$
Step 1
We know that $\cos \frac{\pi}{4} = \frac{1}{\sqrt{2}}$ and $\cos \frac{\pi}{6} = \frac{\sqrt{3}}{2}$. Show more…
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Find the exact values. (a) $\cos \frac{\pi}{4}+\cos \frac{\pi}{6}$ (b) $\cos \frac{5 \pi}{12}\left(\text { use } \frac{5 \pi}{12}=\frac{\pi}{4}+\frac{\pi}{6}\right)$
Exer. $5-10:$ Find the exact values. (a) $\sin \frac{3 \pi}{4}-\sin \frac{\pi}{6}$ b) $\sin \frac{7 \pi}{12}\left(\text { use } \frac{7 \pi}{12}=\frac{3 \pi}{4}-\frac{\pi}{6}\right)$
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