(cos A)/(cos B)=nquad (sin A)/(sin B)=mquad (m^(2)-n^(2))sin^(2)B=?

If (cos A)/(cos B)=m and (cos A)/(sin B)=n then prove that (m^(2)+n^(2))cos^(2)B=n^(2)

If n=(cos alpha)/(cos beta),m=(sin alpha)/(sin beta) then (m^(2)-n^(2))sin^(2)beta is

If (cos x)/(cos y) = n , (sin x)/(sin y) = m , then what is (m^2 - n^2) sin^2 y equal to ?

to prove that (cos A-cos B)^(2)+(sin A-sin B)^(2)=4sin^(2)((A-B)/(2))

cos A = a cos B, sin A = b sin B rArr (b ^ (2) -a ^ (2)) sin ^ (2) B =

Prove that: (cos A-cos B)^(2)+(sin A-sin B)^(2)=4sin^(2)backslash(A-B)/(2)

Prove that (cos A - cos B) ^(2) + (sin A - sin B ) ^(2) = 4 sin ^(2) ((A -B)/( 2 )).

Prove that (cos A-cos B)^(2)+(sin A-sin B)^(2)=4sin^(2)((A-B)/(2))

Prove that (1 + sin A) / (cos A) + (cos B) / (1-sin B) = (2sin A-2sin B) / (sin (AB) + cos A-cos B)

If A and B are complementary angles, prove that : (sin A + sin B)/ (sin A - sin B) + (cos B - cos A)/ (cos B + cos A) = (2)/(2 sin^(2) A - 1)