Two vectors are equal if.

.The sum and difference of two vectors are perpendicular to each other. Prove that the vectors are equal in magnitude.

If resultant of two vectors of equal magnitude is equal to the magnitude of either vector what is the angle between them?

The frequencies and velocities of two waves are equal. If wavelengths of the two waves are lambda_1 and lambda_2 respectively, then.

Are all unit vectors equal ?

If vecu and vecv be two vectors parallel to each other then find vecu xx vecv .

If veca, vecb and vecc are mutually perpendicular vectors of equal magnitudes, show that the vector veca + vecb + vecc is equally inclined to veca, vecb and vecc.

When do we say two vectors are orthogonal?