Use the unit circle to evaluate the followingHow do I solve this problem?

asked Mar 25, 2023 92.1k views

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by Nouiz

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Notice that:

$\cos ((4\pi)/(3))=\cos (\pi+(\pi)/(3))\text{.}$

Recall that:

$\cos (\pi+x)=-\cos (x)\text{.}$

Therefore:

$\cos ((4\pi)/(3))=-\cos ((\pi)/(3))=-(1)/(2)\text{.}$

Answer:

$cos((4\pi)/(3))=-(1)/(2)\text{.}$

Aurath answered Mar 30, 2023

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