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एक रेखा, एक घन के विकर्णों के साथ alph...

एक रेखा, एक घन के विकर्णों के साथ `alpha, beta, gamma, delta`, कोण बनती है तो सिद्ध कीजिए कि
` " " cos ^(2) alpha + cos ^(2) beta + cos ^(2) gamma + cos ^(2) delta = ( 4)/(3)`

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