Question

What is mean by closed bracket and open bracket in inverse trigonometric functions and function please elaborate deeply with examples

Answer 1

[] represents closed bracket
lets take an example [0,π]
this will include the points starting from 0 to π ,including 0 and π.

()represents open bracket
take the same example (0,π)
this will include the points starting from 0 to π ,but not 0 and this will include the π

Inverse trigonometric functions(e.g., sin^-1(0.5) )
Interval Notation: You can represent intervals such as 0 < x < 2 and 4 ≤x ≤6 as (0, 2) U [4, 6] Notice you use open brackets ( ) for < or > and closed brackets [ ] for ≤and ≥