" (i) If "tan A=(5)/(6)" and "tan B=(1)/(11)," prove that "A+B=(pi)/(4)

tan A=(5)/(6) andtanB =(1)/(11), prove that A+B=(pi)/(4)

If tanA=5/6 and tanB=1/(11) , Prove that A+B=pi/.4

If tanA=5/6,tanB=1/11 prove that A+B=pi/4

If tan A=5/6, tan B=1/11," show that A+B=45"^(@) .

Prove that : cos^(-1).(4)/(5)+ tan ^(-1).(3)/(5) = tan^(-1) .(27)/(11) (ii) Prove that : sin^(-1).(3)/(5)+ tan ^(-1).(3)/(5) = tan^(-1) .(27)/(11)

If x=180^(@) ,A = (pi)/(3) and B=(pi)/(6) Prove that tan(A-B)= (tanA-tanB)/(1+tanAtanB)

Prove that tan ((pi) / (12)) * tan (5 (pi) / (12)) * tan (7 (pi) / (12)) * tan (11 (pi) / (12)) = 1

If A+B+C= pi and "tan" (B+C-A)/(4) "tan" (C+A-B)/(4) *"tan" (A+B-C)/(4)=1 , then prove that cosA+ cos B+ cos C=-1

If x=tan ((pi)/(4)+A)+tan(B-(pi)/(4)) and y=tan ((pi)/(4)+A)*tan (B-(pi)/(4)) then (x)/(1-y)=