4 Maths -- Vectors

Prove by vector method:sin(A-B)=sinAcosB-cosAsinBsin(A+B)=sinAcosB+cosAsinBcos(A-B)=cosAcosB+sinAsinBcos(A+B)=cosAcosB-sinAsinB

Prove by vector method:

sin(A-B)=sinAcosB-cosAsinB

sin(A+B)=sinAcosB+cosAsinB

cos(A-B)=cosAcosB+sinAsinB

cos(A+B)=cosAcosB-sinAsinB

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