Zachariah Abraham
Last Activity: 7 Years ago
Well, I don’t know how to do the 2nd one, but here’s the answer to the first:
Rearranging for our convenience:
Now, you may notice that
and
are two co-initial vectors forming sides of the parallelogram
Hence, their resultant is the diagonal, i.e.
So now, the expression becomes:
which gives,
Again, note that
and
form two co-initial sides of the parallelogram
Hence, their resultant is the diagonal, i.e.
Now the expression reduces to
which gives:
It's easy to see that
Thus, the answer is
