If `theta` is the angle between the unit vectors a,b then |a + b| =

If theta is the angle between the unit vectors hat a and hat b then cos (theta/2) is equal to

If theta is the angle between the unit vectors vec a and vec b , then prove that sin (theta)/(2) = 1/2|vec a - vec b|

If theta is th angle between the unit vectors a and b , then prove that cos(theta/2)=1/2| vec a+ vec b| ,and sin(theta/2)=1/2| vec a- vec b|

If theta is th angle between the unit vectors a and b , then prove that cos(theta/2)=1/2| vec a+ vec b| ,and sin(theta/2)=1/2| vec a- vec b|

If theta is the angle between two unit vectors hat(a) and hat(b) then (1)/(2)|hat(a)-hat(b)|=?

If |a| = 4, |b| = 5, |a - b| = 3 and theta is the angle between the vectors a and b , then tan^2 theta =

If theta is the angle between unit vectors bar(A) and bar(B) then (1-bar(A).bar(B))/(1+bar(A)*bar(B)) is equal to