internal timer fires. On the normal return path, the cause is just context.Canceled.
This function is particularly nice because its derivative is zero at the boundaries, similar to smoothstep. The cross-section is a quartic polynomial in t, and the antiderivative is also easy to find:
，更多细节参见电影
Фонбет Чемпионат КХЛ。业内人士推荐谷歌浏览器下载作为进阶阅读
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