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For a triangle with sides 2, 3 and 4, what is the cosine of its largest angle?
A-1/4
B1/4
C-1/3
D11/16
Answer & Solution
Correct answer: A. -1/4
The largest angle faces side 4: (4 + 9 - 16)/(2 x 2 x 3) = -3/12 = -1/4.
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