How do you evaluate $cos (- 420)$ $cos(-420)$ ?

1 Answer

Sep 11, 2016

(1/2)

Explanation:

Trig table of special arcs and unit circle -->
$cos (- 420) = cos (- 60 - 360) = cos (- 60) = cos (60) = \frac{1}{2}$ $cos (-420) = cos (-60 - 360) = cos (-60) = cos (60) = 1/2$

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How do you evaluate $cos (- 420)$ $cos(-420)$ ?

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