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How do you find the value of $cos (\frac{7 π}{6})$ $cos((7pi)/6)$ ?

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Rajat Chatterjee

Nov 7, 2016

$cos (7 \frac{π}{6})$ $cos(7pi/6)$ = $cos (π + \frac{π}{6})$ $cos(pi+pi/6)$ = $- cos (\frac{π}{6})$ $-cos(pi/6)$ = $- \frac{\sqrt{3}}{2}$ $-sqrt3/2$

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