If `theta` is the angle between the unit vectors `veca and vecb`, then prove that
i. `cos((theta)/2)=1/2|veca+vecb|`
` ii. sin (theta/2)=1/2|veca-vecb|`

If theta is the angle between the unit vectors veca and vecb , then prove that cos((theta)/2)=1/2|veca+vecb|

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

If veca and vecb are unit vectors inclined at an angle theta then prove that cos(theta/2) = 1/2|veca +vecb|

If veca and vecb are unit vectors inclined at an angle theta ,then prove that sin(theta/2)=1/2|veca-vecb|

If theta is the angle between unit vectors veca and vecb then sin(theta/2) is (A) 1/2|veca-vecb| (B) 1/2|veca+vecb| (C) 1/2|vecaxxvecb| (D) 1/sqrt(2)sqrt(1-veca.vecb)

If theta is the angle between unit vectors veca and vecb then sin(theta/2) is (A) 1/2|veca-vecb| (B) 1/2|veca+vecb| (C) 1/2|vecaxxvecb| (D) 1/sqrt(2)sqrt(1-veca.vecb)

If theta is the angle between any two vectors veca and vecb , then |veca.vecb|=|veca xx vecb| when theta is equal to

If theta is the angle between unit vectors vecA and vecB , then ((1-vecA.vecB))/(1+vecA.vecB)) is equal to

If theta is the angle between two vectors veca and vecb , then |veca*vecb|=|vecaxxvecb| when theta is equal to :