[" 12."tan(cot^(-1)(4)/(5)+tan^(-1)(3)/(5)=tan^(-1)(27)/(11)]

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

tan^(-1)((4)/(7))-tan^(-1)((1)/(5))=tan^(-1)((1)/(3))

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)

tan^(-1)""(3)/(2) +tan^(-1)""(6)/(5)=pi - tan^(-1)""(27)/(8)

tan(cos^(-1)((3)/(5))+tan^(-1)((1)/(4)))

show that cos^(-1)""(4)/(5)+cot^(-1)""(5)/(3)=tan ^(-1)""(27)/(11) .

cot ^(-1)((1)/(5))+cot ^(-1)((1)/(3))-tan ^(-1)((7)/(4))=

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

P.T. Cos^(-1)((4)/(5))+Sin^(-1)((3)/(sqrt34))=Tan^(-1)((27)/(11)) .

Prove that tan^(-1)""(3)/(4)+tan^(-1)""(3)/(5)-tan^(-1)""(8)/(19)=(pi)/(4)