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11. In a triangle ABC, prove that (a) cos(A+B)+cos C=0 (b) tan (A+B)÷ 2= cot C÷ 2

Answer» 11. In a triangle ABC, prove that (a) cos(A+B)+cos C=0 (b) tan (A+B)÷ 2= cot C÷ 2


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