In any ` A B C` , prove that: `2{bcos^2C/2+ccos^2B/2}=a+c+b`

In any A B C , prove that: 2{b cos^2(C/2) + c cos^2(B/2)}=a+c+b

In any A B C , prove that: 2{asin^2C/2+csin^2A/2}=a+c-b

In any ABC, prove that: 2{b cos^(2)((C)/(2))+c cos^(2)((B)/(2))}=a+c+b

In DeltaABC , prove that: (bcos^(2)C)/2+(c cos^(2)B)/2=s

In DeltaABC , prove that: (bcos^(2)C)/2+(c cos^(2)B)/2=s

In any Delta A B C , prove that: a(b\ cos C-c cosB)=b^2-c^2

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

In any triangle A B C , prove that: (b-c)cot A/2+(c-a)cot B/2+(a-b)cot C/2 =0

In any triangle A B C , prove that following: \ (cos^2B-cos^2C)/(b+c)+(cos^2C-cos^2A)/(c+a)+(cos^2A-cos^2B)/(a+b)=0

In any DeltaABC , prove that : (b^2 + c^2 - a^2)/(c^2 +a^2 -b^2) = (tan B)/(tan A)