Let `A , B , C` be the three angles such that `A+B+C=pi` . If `T a nAtanB=2,` then find the value of `(cos(A-B))/(cosC)`

Let A,B,C be the three angles such that A+B+C=pi , tan A.tan B=2 , then find the value of (cos A cos B)/(cos C)

If Delta ABC is right angled at C, then find the value of cos (A + B)

Let a, b, c be the sides of a triangle and let A, B, C be the respective angles. If b+c=3a, then find the value of the ratio cos((B-C)/2)/cos((B+C)/2)

Let A,B,C be three angles such that A = pi/4 and tan B* tan C=p Find all possible values of p such that A, B, C are three angles of a triangle.

In Delta ABC right angled at C, find the value of cos (A + B).

Let A,B,C, be three angles such that A=(pi)/(4) and tan B tan C=p* Find all possible values of p such that A,B,C are the angles of a triangle.

Let A,B.C be three angles such that A=(pi)/(4) and tan B tan C=P. Find all possible values of P such A,B,C are angles of a triangle

Let A,B.C be three angles such that A=(pi)/(4) and tan B tan C=P. Find all possible values of P such A,B,C are angles of a triangle

If A,B and C are positive such that A+B+C=pi; find then the minimum value of (cos(A-B)/2)/(cos(A+B)/2)+(cos(B-C)/2)/(cos(B+C)/2)+(cos(C-A)/2)/(cos(C+A)/2)