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 Jan 28 revised Tracking a vehicle moving with uniform velocity? Copyediting Jan 28 suggested approved edit on Tracking a vehicle moving with uniform velocity? Nov 6 revised How to measure the angle of the tangent to an ellipse? Added the explicit answer. Nov 4 answered How to measure the angle of the tangent to an ellipse? Oct 21 answered Do the derivatives of the Bessel functions of the first kind with integer order have any singularities? Dec 15 awarded Caucus Oct 23 answered What is the inverse of $f(x)=\frac{e^x+e^{-x}}{e^x-e^{-x}}$? Sep 22 comment How to write $a^{ix}$ in terms of $\sin(x)$ and $\cos(x)$? $e^{\ln(a)}$ is single valued for $a \ne 0$. Sep 20 comment How to write $a^{ix}$ in terms of $\sin(x)$ and $\cos(x)$? $a=e^{\ln a}$ is true for negative values of a: $(a=e^{\ln a}, a\neq 0)$. May 2 answered what will be the answer of this limit. Apr 2 awarded Informed Dec 2 revised Can this gravitational field differential equation be solved, or does it not show what I intended? corrected error in markup Dec 2 suggested approved edit on Can this gravitational field differential equation be solved, or does it not show what I intended? Sep 8 awarded Yearling Sep 2 answered What is the pattern to this sequence? Jul 22 awarded Citizen Patrol Jul 18 reviewed No Action Needed Statistics formula for wifi positioning. May 26 reviewed Reviewed Poisson point process convergence May 26 suggested rejected edit on Poisson point process convergence May 12 reviewed No Action Needed Solve $2^{2x} + 9e^{-2x} = 6$ for x using substitution.