Find cos A and round to the nearest ten-thousandth if a = 12, b = 10, and c = 15.6. 
A) 0.7692
B) 0.8333
C) 0.6410
D) 1.200
Correct Answer:
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A)0.6896
B)0.9523
C)-0.3731
D)0.7242
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