A vector veca has components 3p and 1 wi...

A vector `veca` has components 3p and 1 with rrespect to a rectangular cartesian system. This system is rotated through a certain angle about the origin in the counter clockwise sense. If, with respect to new system, `veca` has components p+1 and `sqrt10` then a value of p is equal to :

-1

`4/5`

`- 5/4`

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