Show by vector method that `sin(alpha-beta)=sinalphacosbeta-cosalpha sinbeta.`

Prove by vector method that sin(alpha+beta)=sinalphacosbeta+cosalphasinbeta.

By vector method, Prove that sin(alpha-beta)=sinalphacosbeta-cosalphasinbeta

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

sin alpha=sinbeta, cos alpha=cos beta then

sinalpha+sinbeta=a ,cosalpha+cosbeta=b=>sin(alpha+beta)

Prove by vector metod the following formula of plane trigonometry cos(alpha-beta)=cosalpha cosbeta+sinalpha sinbeta

Prove by vector metod the following formula of plane trigonometry cos(alpha-beta)=cosalpha cosbeta+sinalpha sinbeta

By geometrical interpretation, prove that (i) sin(alpha+beta)=sin alpha cos beta+sinbeta cosalpha (ii) cos(alpha+beta)=cosalpha cosbeta -sin alpha sinbeta

By geometrical interpretation, prove that (i) sin(alpha+beta)=sin alpha cos beta+sinbeta cosalpha (ii) cos(alpha+beta)=cosalpha cosbeta -sin alpha sinbeta

By geometrical interpretation, prove that (i) sin(alpha+beta)=sin alpha cos beta+sinbeta cosalpha (ii) cos(alpha+beta)=cosalpha cosbeta -sin alpha sinbeta