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In traingle ABC, cos A = sqrt(7/10) and cos B = 3/5.  Find cos C.

 Apr 27, 2022
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arccos (7/10)  ≈  45.57°

 

arccos (3/10)  ≈ 72.54°

 

C = ( 180  - 45.57 - 72.54)   =   61.89°

 

cos 61.89°  ≈  .47

 

cool cool cool

 Apr 28, 2022

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