सिद्ध कीजिए की:
` (cos B- cos A)/( cos A+ cos B) =tan ""( A+ B)/( 2) tan "" (A-B)/( 2) `

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

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

cos (AB) -3cos (A + B) rArr tan A tan B =

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

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

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

If none of A,B, A+B is an integral multiple of pi , then 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: (s in A+s in B)/(cos A+cos B)=tan((A+B)/(2))

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

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