Cost，spend，take用法区别 这三个均可表示“花费”，但在用法和搭配等有很大区别。现分述如下： 一、从所涉及的主语来看 cost的主语通常是事或物（包括 形式主语 it），不. Sec、csc、cot的三角函数公式是secx=1/ (cosx)、cscx=1/ (sinx)、cotx=1/ (tanx)= (cosx)/ (sinx)。三角函数是基本初等函数之一，是以角度为自变量，角度对应任意角终边与单位圆交点坐标或. At a cost与at a cost of的区别在理解“at a cost”与“at a cost of”时，关键在于辨别两者表达的细微差异。实际上，尽管在英文中两者都表示以某种代价进行，但具体的含义和使用.
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