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2h
comment Parametrization of $x^2+y^2-ay=0$
How exactly do you identify $x = \frac{a}{2}cos\theta , y = \frac{a}{2}(1+sin\theta)$ from $\left(\frac{x}{a/2}\right)^2 + \left(\frac{(y-a/2)^2}{a/2}\right)^2 = cos^2\theta + sin^2\theta$ ?
3h
asked Parametrization of $x^2+y^2-ay=0$
May
11
awarded  Editor
May
11
revised Counterclockwise rotation matrix
added 161 characters in body
May
11
comment Counterclockwise rotation matrix
But what is wrong with what I did ?
May
11
asked Counterclockwise rotation matrix
May
4
accepted Limit of $\frac{x}{a+x}$
May
4
comment Limit of $\frac{x}{a+x}$
I understand that it works, I just find strange that the limit should be indeterminate in one expression, and obvious in an equivalent expression.
May
4
asked Limit of $\frac{x}{a+x}$
Apr
8
accepted Integrating $\frac{1}{(x^2+b)^{3/2}}$?
Apr
8
comment Integrating $\frac{1}{(x^2+b)^{3/2}}$?
Do you have a better idea in mind ?
Apr
8
asked Integrating $\frac{1}{(x^2+b)^{3/2}}$?
Apr
8
asked How to integrate $I = \int_{-a/2}^{a/2}\frac{1}{\sqrt{x^2 + b}}dx$
Apr
6
comment Does gaussian elimination always work?
So if I Gauss a matrix A to a triangular matrix T, I might end up with different eigenvalues than those of A ? But why does it work for determinants then ?
Apr
6
asked Does gaussian elimination always work?
Mar
6
accepted Geometric interpretation of a matrix
Mar
6
comment Geometric interpretation of a matrix
Ok if I understood correctly, the rotation doesn't change the area of a geometric figure so the determinant must be 1 and the inverse transformation is a rotation of angle $-\theta$
Mar
6
asked Geometric interpretation of a matrix
Nov
30
accepted Factorize matrix determinant
Nov
30
asked Factorize matrix determinant