if A, B and C are interior angles of a `triangle` ABC, then show that `cos((B+C)/2)` = `sin (A/2)`

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

If A,B and C are the interior angles of a triangle ABC, then show that cot((A+B-C)/(2))=tan C

If A,B and C are the interior angles of a triangle ABC, then show that cot((A+B-C)/(2))=tan C

(i) A,B and C are interior angles of a triangle ABC.Show that sin((B+C)/(2))=cos((A)/(2)) . (ii) If angleA=90^(@) , then find the value of tan((B+C)/(2)) .

If A,B and C are the interior angles of triangle ABC, find tan((B+C)/(2))

If A,B,C are the interior angles of a triangle ABC, prove that (tan(B+C))/(2)=(cot A)/(2)

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 the interior angles of a triangle ABC, prove that tan((C+A)/(2))=(cot B)/(2)( ii) sin((B+C)/(2))=(cos A)/(2)

If A, B, C are angle of a triangle ABC, then the value of the determinant |(sin (A/2), sin (B/2), sin (C/2)), (sin(A+B+C), sin(B/2), cos(A/2)), (cos((A+B+C)/2), tan(A+B+C), sin (C/2))| is less than or equal to