It’s called me a few minutes before the meeting so I’m not working for you and
<u>Prove that:</u>

<u>Proof: </u>
We know that, by Law of Cosines,
<u>Taking</u><u> </u><u>LHS</u>
<em>Substituting</em> the value of <em>cos A, cos B and cos C,</em>



<em>On combining the fractions,</em>

<em>Regrouping the terms,</em>



LHS = RHS proved.
Answer:
15 and 16
Step-by-step explanation:
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Someone is answering for you ! But good luck and try your best !