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In triangle ABC, we have AB=6, BC=12, and AC=7 calculate cos angle A

 Oct 2, 2021
 #1
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Use law of cosines

 

BC^2 = AB^2 + CA^2 - 2 (AB)(CA) cos A      solve for cos A

 Oct 2, 2021
 #2
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would it be -59/84?

Guest Oct 2, 2021

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