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[" (a) "90^(@),60^(@)quad " (b) "60^(@),...

[" (a) "90^(@),60^(@)quad " (b) "60^(@),90^(@)quad " (c) "45^(@),75^(@)quad " (d) "30^(@),120^(@)],[" 6.यदि "/_ABC" में,"1+cos2A+cos2B+cos2C=0" है,तो त्रिभुज "],[" होगा "],[[" (a) समबाह च्रिभुज "," (b) समद्विबाह चिभुज "]]

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