" (a) "2cos^(-1)(4)/(5)=cos^(-1)(7)/(25)

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))

Find the value of "cos"^(-1)((-7)/(25))+"cos"^(-1)(3/(5)) .

Prove that cos^(-1) ((5)/(13))+cos^(-1) (-7/25)+sin^(-1) (36)/(325)=pi

cos(2cos^(-1)(7//25))=

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

cos[sin^(-1)(-4//5)-cos^(-1)(4//5)]=

Find the value of 2cos^(-1)3/(sqrt(13))+cot^(-1)(16)/(63)+1/2cos^(-1)7/(25)

Find the value of 2cos^(-1)3/(sqrt(13))+cot^(-1)(16)/(63)+1/2cos^(-1)7/(25)