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. Fob、cnf、cif的主要区别在于费用、责任和风险的承担方不同。 fob,全称free on board,即船上交货,习惯上称为离岸价。在fob术语下, 买方负责派船接运货物,. 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.
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