Let a and b be two unit vectors. If the vectors c=a+2b and d=5a-4a are perpendicular to each other, then the angle between a and b is

Let hata and hatb be two unit vectors. If the vectors vecc=hata+2hatb and vecd=5hata-4hatb are perpendicular to each other then the angle between hata and hatb is (A) pi/2 (B) pi/3 (C) pi/4 (D) pi/6

Let hata and hatb be two unit vectors. If the vectors vecc=hata+2hatb and vecd=5hata-4hatb are perpendicular to each other then the angle between hata and hatb is (A) pi/2 (B) pi/3 (C) pi/4 (D) pi/6

If veca and vecb are two unit vectors such that veca+2vecb and 5veca-4vecb are perpendicular to each other, then the angle between veca and vecb is

If veca and vecb are two unit vectors such that veca+2vecb and 5veca-4vecb are perpendicular to each other then the angle between veca and vecb is (A) 45^0 (B) 60^0 (C) cos^-1(1/3) (D) cos^-1(2/7)

Two vectors vecP and vecQ that are perpendicular to each other if :

If veca and vecb are unit vectors such that 2veca-4vecb and 10veca+8vecb are perpendicular to each other, then find the angle between these two vectors.

vec(a) and vec(b) are unit vectors and angle between them is pi/k . If vec(a)+2vec(b) and 5vec(a)-4vec(b) are perpendicular to each other then find the integer value of k.

If veca,vecb,vecc are unit vectors such that veca is perpendicular to vecb and vecc and |veca+vecb+vecc|=1 then the angle between vecb and vecc is (A) pi/2 (B) pi (C) 0 (D) (2pi)/3

Two vectors vec(A)and vec(B) are at right angles to each other then

Let vec aa n d vec b be unit vectors that are perpendicular to each other. Then [ vec a+( vec axx vec b) vec b+( vec axx vec b) vec axx vec b] will always be equal to 1 b. 0 c. -1 d. none of these