hinafu
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 Jan 13 awarded Popular Question Sep 24 awarded Autobiographer Mar 20 accepted Notation for multiple of a number? Mar 16 awarded Critic Mar 16 comment Notation for multiple of a number? Old teachers, a couple of friends. Mar 16 asked Notation for multiple of a number? Oct 11 accepted Derivative of square of derivative? 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 awarded Commentator 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. Oct 10 asked Derivative of square of derivative? Aug 5 accepted Help on differential equation $y''-2\sin y'+3y=\cos x$ Jul 23 comment Help on differential equation $y''-2\sin y'+3y=\cos x$ Yes, it is $-2\sin y'$ Jul 23 asked Help on differential equation $y''-2\sin y'+3y=\cos x$ Jul 20 revised Hypergeometric series \sum instead of Sigma Jul 20 suggested approved edit on Hypergeometric series Jul 17 accepted Laplace transform of $\int_1^\infty\frac{\cos t}{t}dt$ 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