A.B.C - 189", prove the following identities 2A 2B 2C =-1-4ABC

In a ABC, prove the following :a cos A+b cos B+ os C=2b sin As in C

Solve the following: In /_\ABC prove the following a^2sin(B-C) = (b^2-c^2)sinA

Prove the following identities : |{:(a,a^(2),a^(3)),(b,b^(2),b^(3)),(c,c^(2),c^(3)):}|=abc(a-b)(b-c)(c-a) .

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 any Delta ABC, prove the following: (a+b+c)(cos A+cos B+cos C)=2((a cos^(2))(1)/(2)(A+b cos^(2))(1)/(2)(B+cos^(2))(1)/(2)C)

In a ABC, prove the following : a^(2)=(b+c)^(2)-4b os ^(2)(A)/(2)

In a ABC, prove the following : 4(bos^(2)(A)/(2)+ca(cos^(2)B)/(2)+ab(cos^(2)C)/(2))=(a+b+c)^(2)

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: sin((B-C)/(2))=(b-c)/(a)(cos A)/(2)