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

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


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