Question

what is value of cos 420⁰ ???​

Answer 1

cos 420⁰

cos(360+60)

Ist quadrant , cos will be +ve

= cos(60)

= 1/2

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Answer 2

Answer:

-1/2

Explanation:

$\cos(420) = \\ \\ = \cos(360 + 60) \\ \\ = ( - cos(60) ) = \\ \\ = - \frac{1}{2}$

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