Medium
Find cos(17π12)\cos (\frac{17 \pi}{12})cos(1217π) exactly using an angle addition or subtraction formula.
2−64\frac{\sqrt{2}-\sqrt{6}}{4}4√2−√6
2+64\frac{\sqrt{2}+\sqrt{6}}{4}4√2+√6
2−54\frac{\sqrt{2}-\sqrt{5}}{4}4√2−√5
3+64\frac{\sqrt{3}+\sqrt{6}}{4}4√3+√6
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