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# Find the exact value using half-angle formulas. $$\cos \left(\frac{7 \pi}{8}\right)$$...

## Question

###### Find the exact value using half-angle formulas. $$\cos \left(\frac{7 \pi}{8}\right)$$

Find the exact value using half-angle formulas. $$\cos \left(\frac{7 \pi}{8}\right)$$

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