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# a + b + c

In the triangle ABC , If ( a + b + c )(a + b - c) = k ab

Prove that : k $$\in \left( 0,2 \right) \quad ,\quad then\quad find\quad m\quad \left( \angle c \right) \quad when\quad k=1\quad$$

Note by Rawan Medhat
10 months, 3 weeks ago

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