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Given that : (1 + cos alpha) (1 + cos be...

Given that : `(1 + cos alpha) (1 + cos beta) (1 + cos gamma)= (1 - cos alpha) (1-cos beta) (1 - cos gamma)`, show that one of the values of each member of this equality is `sin alpha sin beta sin gamma`.

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
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