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 Jun 12 asked Multi variable integral : $\int_0^1 \int_\sqrt{y}^1 \sqrt{x^3+1} \, dx \, dy$ Jun 10 asked Formula to estimate sum to nearly correct : $\sum_{n=1}^\infty\frac{(-1)^n}{n^3}$ Jun 8 awarded Commentator Jun 8 comment Lagrange's method to find min/max question Sorry. Can I ask you, when I read on Wiki, constraint is an equation. and when I ask my teacher, my teacher say when constraint is inequality, we use another method. Jun 8 comment Lagrange's method to find min/max question can you give me an example, please. My teacher says the thing opposite :( that we can sure that no max for that function (in above example) Jun 8 asked Lagrange's method to find min/max question Jun 7 accepted Partial Derivation: $\lim_{(x,y)\to(0,0)}\frac{x^2+\sin^2y}{2x^2+y}$ Jun 7 asked Partial Derivation: $\lim_{(x,y)\to(0,0)}\frac{x^2+\sin^2y}{2x^2+y}$ Jun 4 accepted Sum of two divergence series is always divergence series? Jun 3 comment Sum of two divergence series is always divergence series? @Marvis Oh. sorry so much :( I always think two examples is same :( Jun 3 comment Sum of two divergence series is always divergence series? Take opposite of series and plus together is too special in my opinion. Jun 3 comment Sum of two divergence series is always divergence series? @DavidMitra yes. I have thought your example before, but it's too special. Jun 3 asked Sum of two divergence series is always divergence series? May 30 accepted Maple: how to solving composite function May 28 comment Maple: how to solving composite function No. I don't think it's just for fun. it's nice. but I don't know your solution compare to first one (above post) will be same performance or not :) May 28 comment Maple: how to solving composite function Can you explain a bit at line 3 and 4,please. I know how they work, but I really don't understand why it works right. I'm thinking about your nice solution so much. Thanks :) May 28 asked Maple: how to solving composite function May 22 accepted Evaluating $\int_{0}^{1} \sqrt{1+x^2} \text{ dx}$ May 22 accepted Compute lim from Graph May 22 accepted Min/Max of $f(x,y) = e^{xy}$ where $x^3+y^3=16$