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- My EXCEL is not returning the correct values for sin and cos ...Ray wrote: For example, if I enter =sin (30) in a cell and then move cells, the number in the first cell is -.98803. Similarly, if I enter =cos (30), the number returned is .154251. I had expected .5000 in the first case and .8660 in the second. If you read the help page for SIN and COS, you will see that their argument is radians, not degrees.
- 大家如何评价COS（Collection of Style）这个服装品牌？ - 知乎当你死后，全世界都会开始爱你。. 价格贵，设计非常棒，质量跟优衣库差不多吧. 我手边COS的衣服不多，夏天买了一大堆衣服，可惜尺码没选对，后来全退了单留了件长裤跟衬衣。. 最近买了一件马甲，喜欢的不得了。. 我个人还是很喜欢这个牌子的，衣服种类 ...
- 如何简单快速记住三角函数和差化积、积化和差公式（8 个主要的）? - 知乎sin (x+y)=sinxcosy+cosxsiny. cos (x+y)=cosxcosy-sinxsiny，. 一下就推出了两个公式。. 和差化积和积化和差公式可以互推的，只要一个简单的变量代换就行了。. 三角函数中的和差化积、积化和差公式再高中课本里面已经消失，但这并不意味着数学内容变得浅显，恰恰相反 ...
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