If `A, B, C` are the angles of a triangle ABC that `cos((3A+2B+C)/2)+cos((A-C)/2)=`

If A, B, C are interior angles of triangle ABC, prove that :- cos^2(A/2)+cos^2((B+C)/2)=1 .

If A, B, C are interior angle of triangle ABC then show that sin ((A+B)/2) + cos (( A+ B)/2) = cos (C/2) + sin (C/2)

In Delta ABC, cos""((3A+2B+C)/(2))+ cos""((A-C)/(2))=

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

If A, B, C are the angles of a right angled triangle, then (cos^2A+ cos^2B+ cos^2C) equals

If A,B,C are the angles of a right angled triangle,then (cos^(2)A+cos^(2)B+cos^(2)C) equals

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

In triangle ABC,a,b,c are the lengths of its sides and A,B,C are the angles of triangle ABC .The correct relation is given by (a) (b-c)sin((B-C)/(2))=a(cos A)/(2) (b) (b-c)cos((A)/(2))=as in(B-C)/(2)(c)(b+c)sin((B+C)/(2))=a(cos A)/(2)(d)(b-c)cos((A)/(2))=2a(sin(B+C))/(2)