In `Delta ABC` prove that `cosecA/2cosecB/2cosecC/2ge8`

Prove that cosecA-2cot2AcosA=sinA

In a Delta ABC prove that cos((A+B)/(2))])=(sin C)/(2)

In Delta ABC, prove that (cos 2A)/(a^(2))-(cos 2C)/(c^(2)) = (1)/(a^(2)) - (1)/(c^(2))

In a Delta ABC prove that (tan(A+B))/(2)=(cot C)/(2)

In triangle ABC, prove that sin""(A)/(2)sin""(B)/(2)sin""(C)/(2)le(1)/(8) and hence, prove that co sec ""(A)/(2)+co sec""(B)/(2)+co sec""(C)/(2)ge6 .

Prove that cosecA-2 cot 2A cos A=2sinA.

In Delta ABC prove that 2(b cos^(2)((C)/(2))-c cos^(2)((B)/(2)))=a+b+c

In a Delta ABC, prove that tan((A+B)/(2))=cot((c)/(2))

In any Delta ABC, prove that: (cos^(2)((A)/(2)))/(a)+(cos^(2)((B)/(2)))/(b)+(cos^(2)((c)/(2)))/(c)=(s^(3))/(abc)

In any Delta ABC, prove that : If b+c=2a cos((B-C)/(2)), then prove that A=60^(@).