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माना कि bar(a),bar(b),bar(c) इस प्रकार ...

माना कि `bar(a),bar(b),bar(c)` इस प्रकार के शून्येतर सदिश हैं कि उनमें से कोई दो संरेखीय नहीं हैं तथा `(bar(a)xxbar(b))xxbar(c)=(1)/(3)|bar(b)||bar(c)|bar(a)`. यदि सदिशों `bar(b)` और `bar(c)` के बीच न्यून कोण `theta` हो, तो `sintheta` बराबर है :

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