If `veca and vecb` are unit vectors and `60^@` is the angle between them, then `(2veca -3vecb)*(4veca+vecb)` equals

If veca and vecb are unit vector and theta is the angle between then, then |(veca - vecb)/2| is:

If veca and vecb are two unit vectors and the angle between them is 60^(@) then ((1+veca.vecb))/((1-veca.vecb)) is

If veca and vecb are unit vectors and theta is the angle between them then show that |veca-vecb|=2sin.(theta)/(2)

Let veca and vecb be two unit vectors and theta is the angle between them. Then veca+vecb is a unit vector if:

Let veca and vecb be two unit vectors and alpha be the angle between them, then veca + vecb is a unit vector , if alpha =

Let veca and vecb be two unit vectors and theta is the angle between them. Then veca+vecb is a unit vector if :

Let veca and vecb be two unit vectors and alpha be the angle between them, then veca + vecb is a unit vector , if alpha =

If veca,vecb are unit vectors and theta is the angle between them, show that tan""(theta)/(2)=(|veca-vecb|)/(|veca+vecb|)