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

सिद्ध कीजिए कि 2tan^(-1)sqrt((b)/(a))=cos^(-1)((a-b)/(a+b))

In a triangle Delta ABC , prove the following : 2 abc cos.(A)/(2) cos.(B)/(2) cos.(C )/(2) = (a+b+c)Delta

In a triangle Delta ABC , prove the following : 2 abc cos.(A)/(2) cos.(B)/(2) cos.(C )/(2) = (a+b+c)Delta

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

यदि triangleABC में (If इन triangleABC), a = (1)/(sqrt(6)-sqrt(2)), b = (1)/(sqrt(6)+sqrt(2)), C = 60^(@) तो सिद्ध कीजिए कि (Prove that) c = (sqrt(4))/(2) .

In a Delta ABC, prove that a ( cos B + cos C) = 2 (b + c) sin^(2)""(A)/(2)

In Delta ABC , prove that (b - c)^(2) cos^(2) ((A)/(2)) + (b + c)^(2) sin^(2) ((A)/(2)) = a^(2) .

In a Delta ABC, prove that a sin ((A)/(2) + B) = (b + c) sin ""(A)/(2)