\[ 2\left[a \sin ^{2} \frac{\mathrm{C}}{2}+c \sin ^{2} \frac{\mathr...

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\[
2\left[a \sin ^{2} \frac{\mathrm{C}}{2}+c \sin ^{2} \frac{\mathrm{A}}{2}\right]=c+a-b
\]
\( \mathrm{P} \)
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