Write the following sets in the roster form:
`{x:x^4 - 5 x^2 + 6 = 0, x inR}`

Write the following set in the set-builder form : {2,4,6....}

Write the following set in roster form: A = {x : x is an integer and -3 < x < 7}

Write the following set in roster form: D = {x : x is a prime number which is divisor of 60}

Write the following as intervals : {x : x in R,-4 < x le 6}

Write the following set in roster form: B = {x : x is a natural number less than 6}

Write the following set in roster form: C = {x : x is a two-digit natural number such that the sum of its digits is 8}

Write the following functions in the simplest form: cos^-1 (2x^2 - 1), 0 le x le 1

Write the following in the form x + iy : 1/(-2+ sqrt(-5)) .