Ryu
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 Feb28 comment How to find Error Bounds of Trapezoidal Rule? Thank you for posting the hint !! but I still can't see the next step and why |$cos(x)$| became 1... Would you mind if you explain more ? Feb27 comment Surface area formula The last one made me confuse a lot actually. so Now I found a typo of text book then hehe your formula makes more sense for me !! thanks a lot ! Feb27 comment Surface area formula Hi!! anon I think I can take a scan of textbook and share to this page. but i'm out now so as soon as i got home i will add the link of the text book copy Feb23 comment How can I determine convergence or divergence? I got it !! Thank you !! Feb12 comment How to find $\int_{\frac{\pi}{2}}^{\frac{\pi}{4}}\cot^5x\,\csc^3xdx$ Thank you for sharing idea !! so I can convert $cot^2x = csc^2x-1$ that seems more easier to find the answer :9 Feb8 comment How to find$\int x^2 \arctan(x) \;dx$ Im sorry about confusion. I just begin to use this site so I thought I could vote up for every one because everyone's answer was super good! Forgive me Feb8 comment How can I find the area of the region bounded by the hyperbola My graph was open to up and downwards that's why I couldn't find the region Thank you for posing the graph ! Feb8 comment How to find$\int x^2 \arctan(x) \;dx$ I got it !! Thank you so much !!