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The vector vec a\ a n d\ vec b satisfy...

The vector ` vec a\ a n d\ vec b` satisfy the equation `2 vec a+ vec b= vec p\ and vec a+2 vec b= vec q ,\ w h e r e\ vec p= hat i+ hat j\ a n d\ vec q= hat i- vec jdot` If `theta` is the angle between ` vec a\ a n d\ vec b"\ "` , then
a.`costheta=4/5` b. `sintheta=1/(sqrt(2))` c. `costheta=\ -4/5` d. `costheta=-3/5`

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