ABCD is a parallelogram Fig. 2 (c ) .64....

`ABCD` is a parallelogram Fig. 2 (c ) .64. AC` and (BD) are its diagonals. Show that
` (a) vec (AC) +vec (BD) =2 vec (BC)`
(b) `vec (AC) - vec (BD) =2 vec (AB)`
.

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