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:
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The place where Norton Wood once stood is now a vast field of decaying wheat stubble. The ancient wood was grubbed up during the second world war. No trace of it remains – on the surface, at least. This ghost in the landscape only lives on in the name of the local village: Wood Norton.，推荐阅读体育直播获取更多信息