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

(sin^(2)A-sin^(2)B)/(sin A cos A-sin B cos B) is equal to (a) sin A cos A-sin B cos Btan(A-B)(b)tan(A+B)cot(A-B)(d)cot(A+B)

(sin ^(2) A - sin ^(2) B)/( sin A cos A - sin B cos B) is equal to

If : A+B+C=pi, "then"" "sin ^(2) A +sin^(2)B - sin ^(2)C= A) 2 cos A * cos B * sin C B) 2 cos B * cos C * sin A C) 2 sin A * sin B * cos C D) 2 sin B * sin C * cos A

Prove the following identities: tan^(2)A-tan^(2)B=(cos^(2)B-cos^(2)A)/(cos^(2)B cos^(2)A)=(sin^(2)A-sin^(2)B)/(cos^(2)A cos^(2)B)(sin A-sin B)/(cos A+cos B)+(cos A-cos B)/(sin A+sin B)=0

2sin^(2)B+4cos(A+B)sin A sin B+cos2(A+B)=

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

If A=B=60o, verify that cos(A-B)=cos A cos B+sin A sin B(iii)sin(A-B)=sin A cos B-cos A sin B(iii)tan(A-B)=(tan A-tan B)/(1+tan A tan B)

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).

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