Math, asked by laiba1999, 1 year ago

cos 120 degree is?

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Answered by brainlygeek

1

$\cos(120) = \: \cos(90 + 30) \\ \\ now \: \cos(90 +θ) = - \sin(θ) \\ \\ so \: \cos(90 + 30) = - \sin(30) = - \frac{1}{2} \\ \\$

Answered by rishu6845

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