(i) quad (b+c)cos(B+C)/(2)=a cos(B-C)/(2)

In any Delta ABC, prove that :(b+c)cos((B+C)/(2))=a cos((B-C)/(2))])

For any triangle ABC, prove that (b+c)cos(B+C)/(2)=a cos(B-C)/(2)

Show that (b+c) cos ((B+C)/( 2)) =a cos ((B-C)/( 2))

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

If A+B+C=pi then prove cos( (A)/2) cos( (B-C)/2) + cos( B/2) cos((C-A)/2) + cos( C/2) cos( (A-B)/2) = sinA +sinB+sinC

In a A B C ,\ A D is the bisector of the angle A meeting B C at Ddot If I is the incentre of the triangle, then A I\ : D I is equal to - (s in B+s in C):\ s in A (b) (cos B+cos C): cos A cos((B-C)/2):cos((B+C)/2) (d) sin((B-C)/2):sin((B+C)/2)

Show that : cos A+ cosB + cosC+ cos(A+B+C) = 4cos""(B+C)/(2)cos""(C+A)/(2)cos""(A+B)/(2) .

Show that : cos A+ cosB + cosC+ cos(A+B+C) = 4cos""(B+C)/(2)cos""(C+A)/(2)cos""(A+B)/(2) .

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