`sin{2(sin^(-1)(sqrt(5))/3-cos^(-1)(sqrt(5))/3)}` is equal to `(ksqrt(5))/(81)` then `k=`

sin{2(sin^(-1)(sqrt(5))/(3)-cos^(-1)(sqrt(5))/(3))}quad is equal to (k sqrt(5))/(81) then k=

sin^(-1)(1/sqrt5)+cos^(-1)(3/sqrt(10))

sin^(-1)(-(sqrt(3))/(2))+cos^(-1)((sqrt(3))/(2))

tan(sin^(-1)((3)/(5))+cos^(-1)((3)/(sqrt(13)))=

Sin^(-1)(3/5)+Cos^(-1)(5/sqrt34)=

tan^(-1)(2)=sin^(-1)(2/(sqrt(5)))=cos^(-1)(1/(sqrt(5)))

cot (sin ^(-1)""(1)/(sqrt(5))+sin ^(-1)""(2)/(sqrt(5)))

If alpha=sin(sin^(-1)( 1/sqrt3)/(3)),beta=cos(cos^(-1)((1)/(sqrt(5)))-sin^(-1)((2)/(sqrt(5)))) then (beta^(2))/((3 alpha-4a^(3))^(2)) is

If cos (sin^(-1)(2/sqrt(5)) + cos^(-1)x) = 0, then x is equal to A) 1/sqrt(5) B) (-2/sqrt(5)) C) (2/sqrt(5)) D) 1