How to "rotate" a polar equation?

How to determine the type of singularities

A (non-artificial) example of a ring without maximal ideals

Prove that $\sin(2A)+\sin(2B)+\sin(2C)=4\sin(A)\sin(B)\sin(C)$ when $A,B,C$ are angles of a triangle

Antiderivative $1/z$ on $\mathbb C$

Strategies to find the set of functions $f:\mathbb R\to\mathbb R$ satisfing the functional equation: $f(x^3)+f(y^3)=(x+y)(f(x^2)+f(y^2)-f(xy))$

Are these two definitions of a semimodule basis equivalent?

Piecewise functions: Got an example of a real world piecewise function?

Laurent Series $\exp(1/z)/(1-z)$

Remembering Taylor series

M compact $p\in M$ , there exist $f:M-p\to M-p$ continuous bijection but not homeomorphism?

Sum with binomial coefficients: $\sum_{k=1}^m \frac{1}{k}{m \choose k} $

Limit of $\frac{x^{x^x}}{x}$ as $x\to 0^+$

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