hinafu
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 Mar 16 comment Notation for multiple of a number? Old teachers, a couple of friends. Oct 10 comment Derivative of square of derivative? Thanks for the answer! Oct 10 comment Derivative of square of derivative? The first one: $$\frac{d}{dy}\bigg(\frac{dy}{dx}\bigg)^2$$ Oct 10 comment Derivative of square of derivative? This is okay, but I wanted to get is $\frac{d}{dy}z$ not $\frac{d}{dx}z$ Oct 10 comment Derivative of square of derivative? I have tried it, but when I try to integrate it can't seem to get the original expression. Jul 23 comment Help on differential equation $y''-2\sin y'+3y=\cos x$ Yes, it is $-2\sin y'$ Jul 17 comment Laplace transform of $\int_1^\infty\frac{\cos t}{t}dt$ ok, thanks. I just hope I don't have to solve the integral Jul 11 comment Convergence of $\sum_{n=0}^\infty(-1)^n\frac{4^{n-2}(x-2)}{(n-2)!}$ thanks a lot! this should convince my teacher Jul 11 comment Convergence of $\sum_{n=0}^\infty(-1)^n\frac{4^{n-2}(x-2)}{(n-2)!}$ I sincerely don't know, my teacher asked me that question a week ago and today when he gave me back my exam, it says that the answer was wrong, so I'm trying to find what theorem I should use that $x$ is a constant, I'm pretty sure my teacher doesn't really care about the $(n-2)!$ Jul 11 comment Convergence of $\sum_{n=0}^\infty(-1)^n\frac{4^{n-2}(x-2)}{(n-2)!}$ That's what I'm trying to prove, that $x$ works as a constant, and yes, it is $(n-2)!$ but I can change it to $\Gamma(n-1)$ Jul 11 comment Convergence of $\sum_{n=0}^\infty(-1)^n\frac{4^{n-2}(x-2)}{(n-2)!}$ Is just $(x-2)$ Jul 10 comment Epsilon delta proof of a sequence Thanks!, I will have to practice a lot from now Jul 10 comment Epsilon delta proof of a sequence The limit of the sequence is 1, but I have to prove the limit.