If O is the origin P(2,3) and Q(4,5) are two, points, then `OP*OQ cos anglePOQ`=

If P(2, 3, -6), Q(3, -4, 5) are two points, then anglePOQ is

If O is the origin and P=(2, 3), Q=(4, 5) then OP*OQ cos angle POQ=

If O is the origin and P = (1, -2, 1) and OP bot OQ , then Q =

O is the origin, P(2,3,4) and Q(1,k,1) are points such that bar(OP)botbar(OQ). Find k.

O is the origin , P(2,3,4), Q(1,k,1) are points such that bar(OP) _|_ bar(OQ) then find k.

If O be the origin and if P(x_(1),y_(1)) and P_(2)(x_(2),y_(2)) are two points,the OP_(1)(OP_(2))COS/_P_(1)OP_(2), is equal to

If P(2,3,-6) , Q (3, -4,5) are two points, find the d.c's of vec(OP), vec(QO) and vec(PQ) where O is the origin.