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" 21."" यदि "(a)/(cos A)=(b)/(cos B)=(c)...

" 21."" यदि "(a)/(cos A)=(b)/(cos B)=(c)/(cos C)quad " तथा "a=2" ,तो त्रिभुज "ABC" का क्षत्रफल ज्ञात करो। "

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