\( \mathrm{ABC} \) is a triangle in which \( a=6, b=3 \) and \( \cos (A-B)= \)
\( 4 / 5 . A D \).... VIDEO
\( \mathrm{ABC} \) is a triangle in which \( a=6, b=3 \) and \( \cos (A-B)= \)https://bit.ly/YTAI_PWAP https://www.pw.live
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