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Mathematics
Bob Dobbs's user avatar
Bob Dobbs's user avatar
Bob Dobbs's user avatar
Bob Dobbs
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I am teacher at TNKU.

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All Questions Answers
Score Newest
answer
14
How to calculate $\int_{0}^{\infty}\frac{x^{2}\ln x}{(1+x^{3})^4}dx$
Apr 14
answer
11
How do we evaluate this REALLY tricky integral?
Mar 31
answer
7
$|\sin\phi_{n}(x)| = \sqrt{\frac{1}{2} - \dfrac{1}{2[1+ (\omega_{n}a(x))^{2}]^{1/2}}}$
Sep 27, 2022
question
7
How to prove $\sum_{k=1}^n{n\choose k}\frac{(-1)^{k+1}}{k}=\sum_{k=1}^n\frac{1}{k}$?
Jan 8
answer
7
Evaluate $\sum_{n\geq 0} \mbox{arccot}(n^2 + n + 1)$
Nov 2, 2022
answer
7
Easiest way to evaluate $\int_0^{\pi/6}\sec x\,dx$?
Jul 12, 2022
question
6
Definite integral by Malmsten's formula
Sep 19, 2022
answer
5
Show that $\int_{0}^{2}\sqrt{x^2+1}\,dx$ is at least $2\sqrt{2}$ without evaluating the integral
Oct 7, 2022
answer
5
Evaluating limit without L'Hospital rule
Jan 3
answer
4
Find the intersection points of two circles
Jan 14

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