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In any triangle $A B C$ $a \cdot \cos ^2 \frac{A}{2}+b \cdot \cos ^2 \frac{B}{2}+c \cdot \cos ^2 \frac{C}{2}=$
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Verified Answer
The correct answer is:
$s+\frac{\Delta}{R}$
No solution. Refer to answer key.
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