" 5.Prove by vector method that "sin(alpha+beta)=sin a cos beta+cos alpha sin beta" ."

Prove by vector methods that sin(alpha+beta)=sin alpha cos beta+cos alpha sin beta

Prove by vector methods that sin(alpha+beta)=sin alphacos beta+cos alphasin beta

Using vectors prove that sin(alpha - beta) = sin alpha cos beta- cos alpha sin beta .

Using vectors, prove that sin (alpha+beta)=sin alpha cos beta+ cos alpha sin beta .

Prove by vectors that : cos (alpha - beta) = cos alpha cos beta+ sin alpha sin beta .

Prove by vectors that : cos (alpha + beta) = cos alpha cos beta- sin alpha sin beta .

(i) sin (alpha + beta) = sin alpha cos beta + cos alpha sin beta) (ii) sin (alpha-beta)= sin alpha cos beta- cos alpha sin beta Proof

Prove that 2 sin^2 beta + 4 cos(alpha + beta) sin alpha sin beta + cos 2(alpha + beta) = cos 2alpha

Prove that 2 sin^2 beta + 4 cos(alpha + beta) sin alpha sin beta + cos 2(alpha + beta) = cos 2alpha