`Delta ABC` में सिद्ध कीजिए कि -
` a (cos^(2) . C/2 - cos^2. B/2) = (b-c) * cos^(2) . A/2 `

In any triangle ABC, prove that : a (cos C - cos B) = 2 (b-c) cos^2 frac (A)(2) .

In Delta ABC, sum a^2 (cos^2 B-cos^2 C) =

In Delta ABC,b(cos^(2)C)/(2)+c(cos^(2)B)/(2)=

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

In Delta ABC prove that a^2(cos^2B - cos^2C) + b^2(cos^2C - cos^2A) + c^2(cos^2A - cos^2B) = 0

Delta ABC, (bc) / (a) cos ^ (2) ((A) / (2)) + (ca) / (b) cos ^ (2) ((B) / (2)) + (ab) / (c) cos ^ (2) ((C) / (2)) =

In any triangle ABC, prove that : a (b cos C-c cos B) = b^2 -c^2 .

In a Delta ABC, a (cos^2 B+cos^2 C)+cos A(c cos C+b cos B)=