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Q)

In a triangle ABC, $2ca \sin \frac{A - B + C}{2}$ is equal to :


( A ) $a^2 + b^2 - c^2$
( B ) $b^2 - c^2 - a^2$
( C ) $c^2 - a^2 - b^2$
( D ) $c^2 + a^2 - b^2$

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