In \( \triangle A B C \), if \( \operatorname{ar}(\triangle A B C)=8 \). Then, \( a^{2} \sin (2 ....

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In \( \triangle A B C \), if \( \operatorname{ar}(\triangle A B C)=8 \). Then, \( a^{2} \sin (2 B)+b^{2} \sin (2 A) \) is equal to
(1) 2
(2) 16
(3) 32
(4) 128


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