tan^(-1)a+tan^(-1)b

Write the value of tan^(-1)a/b-tan^(-1)((a-b)/(a+b))

If the non-zero numbers a,b,c are in AP and tan^-1a,tan^-1b,tan^-1c are also in AP, then

Write the value of tan^(-1)(a/b)-tan^(-1)((a-b)/(a+b))

If A=tan1 and B=tan^(-1)1 then

If theta=tan^(-1)a,phi=tan^(-1)b and ab=-1 then theta-phi is

tan^-1a+tan^-1b=pi/4 . Find the value of a+b-(a^2+b^2)/2+(a^3+b^3)/3-(a^4+b^4)/5+ . . .

What is the angle between vector A and the resultant of vector(A+B) and vector(A-B)? (2) tan (B) 1(A-B ) ) (3) tan-1 (4) tan-1 (4) tan-1 -B