Let \( \Delta=\left|\begin{array}{ccc}a & a+d & a+3 d \\ a+d & a+2 d & a \\ a+2 ... VIDEO
Let \( \Delta=\left|\begin{array}{ccc}a & a+d & a+3 d \\ a+d & a+2 d & a \\ a+2 d & a & a+d\end{array}\right| \) then :https://bit.ly/YTAI_PWAP https://www.pw.live
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