In any `DeltaABC`, prove that `acos""((B-C)/2)=(b+c)sin""(A/2)`.

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

In any DeltaABC , prove that asin""1/2(B-C)=(b-c)cos""1/2A

In any DeltaABC , prove that asin(A/2+B)=(b+c)sin""A/2

In DeltaABC , prove that: a(cosB+cosC)=2(b+c)sin^(2)A/2 .

In any DeltaABC , prove that (i) tan""(B-C)/2=(b-c)/(b+c)cot""A/2 . (ii) If angleB=90^(@) , prove that tan(A/2)=sqrt(((b-c)/(b+c))) . (iii) If angleC=90^(@) , prove that tan((A−B)/2)/tan((A+B)/2)=(a-b)/(a+b) .

In any DeltaABC , prove that a(cosC-cosB)=2(b-c)cos^(2)""1/2A

In any DeltaABC , prove that (sinA)/(sin(A+B))=a/c

In any DeltaABC , prove that acos(A+B+C)-bcos(B+A)-c""cos(A+C)=0

In any DeltaABC , prove that (sin B)/(sin(B+C) ) = b/a

In any DeltaABC , prove that (a-b)^(2)cos^(2)(C/2)+(a+b)^(2)sin^(2)(C /2)=c^(2) .