Question: 9. If in a triangle ABC, cos A cosB + sin A sin B Sin C = 1, then, with usual notation in AABC,

9. If in a triangle ABC, cos A cosB + sin A

9. If in a triangle ABC, cos A cosB + sin A sin B Sin C = 1, then, with usual notation in AABC, a) the triangle is isosceles b) the triangle is right angled R:r=(V2+1):1 d) :5:5 =1:1:(V2 +1) c)

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