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If the two adjacent sides of two recta...

If the two adjacent sides of two rectangles are represented by vectors ` vec p=5 vec a-3 vec b ; vec q=- vec a-2 vec b \ and \ vec r=-4 vec a- vec b ; vec s=- vec a+ vec b ,` respectively, then the angel between the vector ` vec x=1/3( vec p+ vec r+ vec s) \ and \ vec y=1/5( vec r+ vec s)` is a.`-cos^(-1)((19)/(5sqrt(43)))` b. `cos^(-1)((19)/(5sqrt(43)))` c. `pi-cos^(-1)((19)/(5sqrt(43)))` d. cannot be evaluate

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