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Find cos A.

 

 May 14, 2022
 #1
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You can use cosine law to find c first.

 

\(c^2 = 8^2 + 11^2 - 2\cdot 8 \cdot 11 \cos 37^\circ\\ c \approx 6.666344593\)

 

Then, use cosine law again to find cos A.

 

\(8^2 = c^2 + 11^2 - 2\cdot c \cdot 11 \cos A\)

 

Substitute the value of c calculated above. Can you take it from here?

 May 15, 2022

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