If angle between two unit vectors `veca` and `vecb` is `theta` then `sin(theta/2)` is equal to

If angle between two unit vectors vec a and vec b is theta then sin((theta)/(2)) is equal to

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

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