1. Given that $sinfrac{pi}{5} approx 0.5878$, use equivalent trigonometric expressions to evaluate the following, to four decimal places. a) $cosfrac{3pi}{10}$ b) $cosfrac{7pi}{10}$
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- Given: \(\sin \frac{\pi}{5} \approx 0.5878\) - We need to find \(\cos \frac{7\pi}{10}\) to four decimal places. Show more…
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