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$\cos â¡ 22^{â} + \cos â¡ 78^{â} + \cos â¡ 80^{â} =$

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detailed solution

Correct option is C

Apply the identity, if A+B+C=180Â° then cos A+cos B+cos C=1+4sinâ¡(A/2)sinâ¡(B/2)sinâ¡(C/2)

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cosâ¡22â+cosâ¡78â+cosâ¡80â=

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$\cos â¡ 22^{â} + \cos â¡ 78^{â} + \cos â¡ 80^{â} =$