gog5.cos^(-1)(-(1)/(2))

cos[2cos^(-1)((1)/(5))+sin^(-1)((1)/(5))] =

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

cos^(-1)((3)/(5))+cos^(-1)((4)/(5))=(pi)/(2)

cos[2(tan^(-1)((1)/(5))+tan^(-1)5)] = ________.

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))

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

sin^(-1)(1/5)+cos^(-1)x=(pi)/(2)

cos[2cos^(-1).(1)/(5)+sin^(-1).(1)/(5)] =

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