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" 4."sin^(2)(A+B)-sin^(2)(A-B)=sin2A*sin...

" 4."sin^(2)(A+B)-sin^(2)(A-B)=sin2A*sin2B

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Prove that sin^(2)(A+B)-sin^(2)(A-B)=sin2A*sin2B

sin(A+B).sin(A- B)=sin^(2)A-sin^(2)B

sin(A+B).sin(A- B)=sin^(2)A-sin^(2)B

sin(A+B).sin(A- B)=sin^(2)A-sin^(2)B

sin(A+B).sin(A- B)=sin^(2)A-sin^(2)B

If (cos^(4)A)/(cos^(2)B)+(sin^(4)A)/(sin^(2)B)=1 then prove that (i)sin^(2)A+sin^(2)B=2sin^(2)A sin^(2)B(ii)(cos^(4)B)/(cos^(2)A)+(sin^(4)B)/(sin^(2)A)=1

Prove that : sin (A + B) sin (A - B) = sin^2A- sin^2B .

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