\[ b^{2} \cos 2 \mathrm{~A}-a^{2} \cos 2 \mathrm{~B}=b^{2}-a^{2} \] W

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\[
b^{2} \cos 2 \mathrm{~A}-a^{2} \cos 2 \mathrm{~B}=b^{2}-a^{2}
\]
W
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