" For any two real numbers "A,B cos(A+B)cos(A-B)=

For any two real numbers C and D , cosC+cos D=

For any angles A and B, cos(A+B).cos(A-B)=…..

For any two real numbers a and b, sqrt((a-b)^2)+sqrt((b-a)^2) is

For any real number of x and y, if cos x=cos y then:

If B be the exterior angle of a regular polygon of n - sides and A is any constant then cos A + cos(A+ B)+cos(A+2B)....n terms is equal to

For any two real numbers a and b,we define a R b if and only if sin^(2)a+cos^(2)b=1. The relation R is

For any two real numbers a and b , we define aRb if and only if sin ^(2) a +cos ^(2) b=1 , the relation R is -

For any two real numbers, an operation ** defined by a**b=1+ab is

For any two real numbers, an operation '*' defined by a*b = 1 + ab is

For any two real numbers, an operation * defined by a *b = 1 + ab is