# arctan 7 4

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### Application of Poj 4227 inverse tangent function

Label:Description 反正切函数可展开成无穷级数，有如下公式 (其中0 &lt;= x &lt;= 1) 公式(1) 使用反正切函数计算PI是一种常用的方法。例如，最简单的计算PI的方法： PI=4arctan(1)=4(1-1/3+1/5-1/7+1/9-1/11+...) 公式(2) 然而，这种方法的效率很低，但我们可以根据角度和的正切函数公式： tan(a+b)=[tan(a)+tan(b)]/[1-tan(a)*tan(b)]

### Assignment 29 Generalized integrals

Label:1. (1)\[\mbox{original}= \lim_{b\to +\infty} \int_1^b \frac{e^2}{e^{2x}+e^2}dx= \frac1e \lim_{b\ to+\infty} \arctan (e^x/e) \bigg|_{1} ^B=\FRAC1E (\lim_{b\to +\infty}\arctan \frac{e^b}{e}-\frac{\pi}{4}) =\frac{\pi}{4

### Four-axis aircraft design Report

Tags: line of thought linear presentation comparative thesis design of frequency circuit of battery UniversityA report on the application of SCM in practical training design(Four-axis aircraft)Department: Department of Electrical Information

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