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Américo Tavares

Queluz, Portugal

problemasteoremas.wordpress.com

Age: 62

I'm a retired Portuguese electrical engineer.

You can contact me at acltavares[at]sapo[dot]pt

Blog Problemas Teoremas.

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31s		reviewed	Approve suggested edit on How is $(\arg F)(z)$ of complex function calculated?
1h		revised	Find the volume using triple integrals Added (integral) tag; fixed two spelling typos
1d		revised	How can evaluate $\lim_{x\to0}\frac{3x^2}{\tan(x)\sin(x)}$? added 116 characters in body
1d		reviewed	Approve suggested edit on An integer $n$, such that $nx = 0$, where $x$ belongs to the quotient group $\Bbb Q/\Bbb Z$
1d		reviewed	Approve suggested edit on What powers of an $18$ cycle permutation are also $18$ cycles?
1d		answered	How can evaluate $\lim_{x\to0}\frac{3x^2}{\tan(x)\sin(x)}$?
1d		revised	How can evaluate $\lim_{x\to0}\frac{3x^2}{\tan(x)\sin(x)}$? Fixed TeX code for sin and tan
1d		reviewed	Approve suggested edit on What is $\sum_{i=1}^n \sqrt i$
2d		reviewed	Approve suggested edit on Number of positive integers that cannot be expressed as $ax+by$
2d		revised	Graphing $\sin(\|x\|)$? Replaced \operatorname{abs}(x) by \|x\|
2d		comment	Solve $\tanα+2\tan2α+4\tan4α+8\tan8α+16\tanα=\cotα$ for $\alpha$ Is the equation right? $\tan\alpha+\dots+16\tan\alpha=$
2d		comment	How to modify the headers of this book to lower case? Many thanks! Done, worked as expected.
2d		comment	How to modify the headers of this book to lower case? Is it possible to change the header from italic to normal, by adding some code?
2d		revised	Integrate ${\sec 4x}$ Fixed spelling typo
2d		revised	How to evaluate the trigonometric integral $\int \frac{1}{\cos x+\tan x }dx$ Fixed spelling typo and added link
2d		answered	How to evaluate the trigonometric integral $\int \frac{1}{\cos x+\tan x }dx$
Jun 15		reviewed	Approve suggested edit on Probability (usage of recursion)
Jun 15		revised	How to evaluate the trigonometric integral $\int \frac{1}{\cos x+\tan x }dx$ Added (calculus), (indefinite-integral) and (integral) tags
Jun 15		reviewed	Approve suggested edit on General solution of the equation $x_1 \cdots x_n + A = 0$ in complex numbers
Jun 14		comment	Fourier Properties Does $f(x)g(x)$ denotes the convolution $ (fg)(x) = \int_{-\infty}^\infty f(y)g(x - y)\,dy$ ?