Calculus
[4,∞)\(\left\[\lbrack\)4,\(\infty\]\right\))
(−∞,−4] and [4,∞)\(\left\)(-\(\infty\),-4\(\right\)\(\rbrack\[\text{ and }\]\left\[\lbrack\)4,\(\infty\]\right\))
(−∞,−4] and [−4,∞)\(\left\)(-\(\infty\),-4\(\right\)\(\rbrack\[\text{ and }\]\left\[\lbrack\)-4,\(\infty\]\right\))
(−∞,4] and [4,∞)\(\left\)(-\(\infty\),4\(\right\)\(\rbrack\[\text{ and }\]\left\[\lbrack\)4,\(\infty\]\right\))