# Tunk-Fey

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bio website facebook.com/TunkFey location Bandung, West Java, Indonesia age 29 member for 11 months seen Sep 18 at 15:36 profile views 2,727

My nickname is Tunk-Fey but you can call me $\mathbb{FEY}$ or $\mathbb{ARI}$.

You can contact me at ariawan.11@gmail.com.

## Gotcha...!!!

 83 How to find ${\large\int}_0^1\frac{\ln^3(1+x)\ln x}x\mathrm dx$ 43 Calculate $\frac{1}{5^1}+\frac{3}{5^3}+\frac{5}{5^5}+\frac{7}{5^7}+\frac{9}{5^9}+\cdots$ 38 The Monster Integral 32 Taking Calculus in a few days and I still don't know how to factorize quadratics 30 Odd $\sin/\cos$ integral

# 18,034 Reputation

 +10 How to find ${\large\int}_0^1\frac{\ln^3(1+x)\ln x}x\mathrm dx$ +70 The Monster Integral +10 Evaluate $\int_0^\infty\frac{\ln x}{1+x^2}dx$ +5 Closed-forms for several tough integrals

# 7 Questions

 22 Closed-forms for several tough integrals 18 An equation that generates a beautiful or unique shape for motivating students in mathematics 7 Random Triangle Inscribed in a Circular Sector 6 $1 + 1 + 1 +\cdots = -\frac{1}{2}$ 6 Dual Integral Problems: $\int\left(\pi^{\sin^2x}+e^{\sin^2x}\right)^2\cos2x~dx$ and $\int\frac{\sin x}{1+\cos x+e^x}dx$

# 112 Tags

 1k calculus × 259 272 closed-form × 14 998 integration × 197 269 indefinite-integrals × 60 693 definite-integrals × 124 268 trigonometry × 56 400 improper-integrals × 65 210 sequences-and-series × 36 339 algebra-precalculus × 76 209 real-analysis × 40

# 11 Accounts

 Mathematics 18,034 rep 74784 Physics 141 rep 8 English Language & Usage 111 rep 3 Stack Overflow 101 rep 6 Cross Validated 101 rep 3