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If sin x + sin y + sin z = 0 and cos x + cos y + cos z = 0 then what is the value of cos (x - y) = ?

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If sin x + sin y + sin z = 0 and cos x + cos y + cos z = 0 then what is the value of cos (x - y) = ?
posted May 18, 2018 by Rahul Vaidya

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1 Answer

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answer Sep 26, 2018 by Tejas Naik
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