[" Shour by Vector.mathad that "],[" sun "0A=2sin A cos A" ."]

Prove by vector method that sin(A-B)=sin A cos B-cos A sin B and sin(A+B)=sin A cos B+cos A sin B

Prove by vector method that cos(A+B)=cos A cos B-sin A sin B

Prove by vector method that cos(A+B)cos A cos B-sin A sin B

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

Prove by vector methods. cos(A- B) = cos A cos B + sin A sin B.

Prove that : (sin3A+sin A)sin A+(cos3A-cos A)cos A=0

The number of solutions that the equation sin (cos (sin x))= cos (sin (cos x)) has in [0, (pi)/(2)], is "_____"

Prove that: (sin3A+sin A)sin A+(cos3A-cos A)cos A=0

Prove that: \ (sin3A+sin A)sin A+(cos3A-cos A)cos A=0

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