If \( \mathrm{A}=45^{\circ} \), verify that : \[ \sin 2 \mathrm{~A}...

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If \( \mathrm{A}=45^{\circ} \), verify that :
\[
\sin 2 \mathrm{~A}=2 \sin \mathrm{A} \cos \mathrm{A}
\]
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