関連ワード:  when a function is decreasing    when a function is increasing or decreasing    intervals where a function is decreasing    how to find when a function is decreasing    how to know when a function is decreasing    how to find when a function is decreasing most rapidly    when is a function decreasing derivative    how to know when a function is decreasing or increasing    when a function is neither increasing nor decreasing    when is a function decreasing at an increasing rate