(sin A+sin2A)/(cos A-cos2A)=cot(A)/(2)

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

prove that: (sin2x-sin2y)/(cos2y-cos2x)=cot(x+y)

(sin 2x - sin 2y)/(cos 2y-cos 2x) = cot (x+y)

(sin A + sin2A) / (1 + cos A + cos2A) = tan A

prove that ((cos A+cos B)/(sin A-sin B))^(n)+((sin A+sin B)/(cos A-cos B))^(n)=2cot^(n)((A-B)/(2)),n is even

Prove that: ((cos A+cos B)/(sin A-sin B))^(n)+((sin A+sin B)/(cos A-cos B))^(n)={2cot^(n)((A-B)/(2)),quad if niseven0,if nisodd

prove that (sin2A)/(1-cos2A)=cot A

Prove that ( sin 2 A )/( 1 - cos 2 A) = cot A

(cos3A-cos A)/(sin3A-sin A)+(cos2A-cos4A)/(sin4A-sin2A)=(sin A)/(cos2A cos3A)

Prove that (1)sin2A=2sin A cos A(2)cos2A=cos^(2)A-sin^(2)A