`cos^(-1)((3)/(5))+cos^(-1)((4)/(5))=`

Prove that cos^(-1)((3)/(5))+cos^(-1)((12)/(13))+cos^(-1)((63)/(65))=(pi)/(2)

If |z-25i|le15 , then |maximum arg(z) - minimum arg(z)| equals (A) (pi)/(2)+cos^(-1)((3)/(5)) (B) sin^(-1)((3)/(5))-cos^(-1)((3)/(5)) (C) 2cos^(-1)((4)/(5)) (D) 2cos^(-1)((1)/(5))

cos^(-1)((4)/(5))+cos^(-1)((12)/(13)) =

Which of the following angles is greater? theta_(1)=sin^(-1)((4)/(5))+sin^(-1)((1)/(3)) or theta_(2)=cos^(-1)((4)/(5))+cos^(-1)((1)/(3))

Prove that 2sin^(-1)((3)/(5))-cos^(-1)((5)/(13))=cos^(-1)((323)/(325))

Prove that : cos^(-1).(3)/(5)+ cos^(-1).(12)/(13) = sin^(-1)((12)/(5))

sin(cos^(-1)(4/5))

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

Write the value of cos^(2)((1)/(2)cos^(-1)(3)/(5))

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