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" (iii) "(sin(B+A)+cos(B-A))/(sin(B-A)+c...

" (iii) "(sin(B+A)+cos(B-A))/(sin(B-A)+cos(B+A))=(cos A+sin A)/(cos A-sin A)

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Prove that (sin(B+A)+cos(B-A))/(sin(B-A)+cos(B+A))=(cos A+sin A)/(cos A-sin A)

(sin(B+A)+cos(B-A))/(sin(B-A)+cos(B+A)) is equal to

(sin(B+A)+cos(B-A))/(sin(B-A)+cos(B+A)) is equal to

sin(A+B). cos(A-B)+sin(A-B). cos(A+B)=

(sin(A - B))/(cos A cos B) + (sin (B - C))/( cos B cos C) + (sin(C - A))/(cos C cos A) is

(sin(A+B)+cos A-sin(A-B))/(cos(A-B)+sin A-cos(A+B))=

(cos A)/(sin B sin C)+(cos B)/(sin C sin A)+(cos C)/(sin A sin B)=2

Prove that: (sin(B-C))/(cos B cos C)+(sin(C-A))/(cos C cos A)+(sin(A-B))/(cos A cos B)=0

Prove that (sin(B-C))/(cos B cos C)+(sin(C-A))/(cos C cos A)+(sin(A-B))/(cos A cos B)=0