If `3vecp+2vecq=hati+hatj+hatk and 3 vecp-2vecq=hati-hatj-hatk` then the angle between `vecp and vecq` is (A) `pi/6` (B) `pi/4` (C) `pi/3` (D) `pi/2`

If vecP.vecQ=PQ then angle between vecP and vecQ is

Let vecA be a vector parallel to the of intersection of planes P_1 and P_2 through origin. P_1 is parallel to the vectors 2hatj+3hatk and 3hatj-3hatk and P_2 is parallel to hatj-hatk and 3hati+3hatj then the angle between the vectors vecA and 2hati+hatj-2hatk is (A) pi/2 (B) pi/4 (C) pi/6 (D) (3pi)/4

A non vector veca is parallel to the line of intersection of the plane determined by the vectors hati,hati+hatj and thepane determined by the vectors hati-hatj,hati+hatk then angle between veca and hati-2hatj+2hatk is = (A) pi/2 (B) pi/3 (C) pi/6 (D) pi/4

What is the angle between (vecP+vecQ) and (vecPxxvecQ)

If |vecP + vecQ| = |vecP -vecQ| the angle between vecP and vecQ is

The acute angle between the lines vecr=(4hati-hatj)+5(2hati+hatj-3hatk) and vecr=(hati-hatj+2hatk)+t(hati-3hatj+2hatk) is (A) (3pi)/2 (B) pi/3 (C) (2pi)/3 (D) pi/6

The resultant of vecP and vecQ is perpendicular to vecP . What is the angle between vecP and vecQ

If a=3hati-2hatj+hatk,b=2hati-4hatj-3hatk and c=-hati+2hatj+2hatk , then a+b+c is