(b) Give the domain of \( d \).
Write your answer as an interval or a union of intervals.
Domain: \( \square \)
(c) Determine the interval(s) in the domain of \( d \) on which the function is increasing, and the interval(s) in the domain of \( d \) on which the function is decreasing. Use exact values in your answers (not decimal approximations).
Write each answer as an interval or a list of intervals. When writing a list of intervals, make sure to separate them with commas and to use as few intervals as possible. Click on "None" if applicable.
Interval(s) on which \( d \) is increasing: \( \square \)
類
\( \square \)
\( \square \) \( \sqrt{\square} \) .
\( \bar{\square} \)
\( \square \)
\( \square \)
\( \square \)
\( \sqrt[\square]{\square} \)
\( \log _{\mathbf{n}} \)
Interval(s) on which \( d \) is decreasing: \( \square \) \( e \) (口, ㅁ)