In any `Delta ABC,` prove the following : `r_1=rcot(B/2)cot(C/2)`

In any Delta ABC, prove the following : r_(1)=r cot((B)/(2))cot((C)/(2))

In any Delta ABC, prove that (b+c-a)(cot,(B)/(2)+cot,(C)/(2))=2a cot,(A)/(2)

In any Delta ABC, prove that cot((A)/(2))+cot((B)/(2))+cot((C)/(2))=(a+b+c)/(b+c-a)cot((A)/(2))

In any triangle ABC, prove that following: (a-b)(cos C)/(2)c sin((A-B)/(2))

In any triangle ABC, prove that following: (a^(2)-c^(2))/(b^(2))=(sin(A-C))/(sin(A+C))

In any triangle ABC, prove that following: a^(2)sin(B-C)=(b^(2)-c^(2))s in A

In any triangle ABC ,prove that following: (a+b)/(c)=(cos((A-B)/(2)))/((sin C)/(2))

In any triangle ABC, prove that following: sin((B-C)/(2))=(b-c)/(a)(cos A)/(2)

In any triangle ABC, prove that following: (c)/(a+b)=(1-tan((A)/(2))tan((B)/(2)))/(1+tan((A)/(2))tan((B)/(2)))

In any Delta ABC, porve that (a+b-c)cot((B)/(2))=(a-b+c)cot((C)/(2))