[" 19.Prove that: "],[[" (i) "sin(A+B)si...

[" 19.Prove that: "],[[" (i) "sin(A+B)sin(A-B)+sin(B+C)sin(B-C)+sin(C+A)sin(C-A)=0," (in "(C-A)=0],[" (ii) "tan{(2n+1)pi+theta}+tan[(2n+1)pi-theta]=0]]]

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19. Prove that sin(A +B) sin(A-B)+sin(B+C)sin(B-C) + sin(C+A) sin(C-A)=0

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