a and -a are colinear vector
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the photo is right answer
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![](https://hi-static.z-dn.net/files/d05/65d00f1264cef514113fafdd2f72d784.jpg)
![](https://hi-static.z-dn.net/files/d96/674947ab2594e6c8d20ed8d729f8ca72.jpg)
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