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[" 12."(1-cos A+cos B-cos(A+B))/(1+cos A...

[" 12."(1-cos A+cos B-cos(A+B))/(1+cos A-cos B-cos(A+B))=tan(A)/(2)cot(B)/(2)],[" 13."(sin^(2)A-sin^(2)B)/(sin A cos A-sin B cos B)=tan(A+B)]

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Prove that (1-cos A+cos B-cos(A+B))/(1+cos A-cos B-cos(A+B))=tan((A)/(2))cot((B)/(2))

Prove that :(tan(A+B))/(cot(A-B))=(sin^(2)A-sin^(2)B)/(cos^(2)A-sin^(2)B)

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

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

(sin A-sin B)/(cos B-cos A)=cot((A+B)/(2))

Prove that (sin A-sin B)/(cos A+ cos B) = "tan" (A-B)/2

(cos 2B - cos 2 A)/( sin 2 A + sin 2 B) = tan (A -B).

Prove that: (sin A-sin B)/(cos A+cos B)=tan((A-B)/2)

Prove that :(tan(A+B))/("cot"(A-B))=(sin^2A-sin^2B)/(cos^2A-sin^2B)

Show that: tan(A+B).tan(A-B)=(sin^(2)A-sin^(2)B)/(cos^(2)A-sin^(2)B).