If the figure is the same as here:
then the answer is the following.
1. Let's plot the vector , which is the initial vector just with double length:
2. Now let's find the vector , which has the same length but opposite diraction with the :
3. Finally, let's add the vectors and to obtain the given expression. Using the the parallelogram method (see dashed lines):
Thus, the answer seems to be the first one (a).
Answer. a.
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