mpockmon mpockmon

24-03-2021
Mathematics

contestada

cos (B+C - A) + cos (C+ A-B) + cos( A+B+C)
= 1 + 4 cos A.cos B.cos C.

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kaylab699 kaylab699

24-03-2021

can you explain more

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king8587 king8587

24-03-2021

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