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Show that ΔABC is an isosceles triangle, if the determinant Δ=∣∣∣∣1111+cos A1+cos B1+cos Ccos2 A+cos Acos2 B+cos Bcos2 C+cos C∣∣∣∣=0 |
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Answer» Show that ΔABC is an isosceles triangle, if the determinant |
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