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18h
answered How do i evaluate the following integral?
23h
answered How would I prove this strange combinatorial identity?
1d
revised sum of a telescoping series
added 7 characters in body
1d
answered sum of a telescoping series
1d
comment Identifying compositions of reflections, and rotations in a hexagon
@Mark You were right, I just fixed it.
1d
revised Identifying compositions of reflections, and rotations in a hexagon
deleted 112 characters in body
2d
comment Prove that $\int_0^1\int_x^1 \frac{f(y)}ydy\,dx=\int_0^1f(x)\,dx$ if $f$ is Lebesgue integrable
Is $g$ even differentiable?
Apr
22
comment $R^2$ a subspace of $R^3$
$\mathbb{R}^2$ is NOT a subspace of $\mathbb{R}^3$, but isomorphic to any $2$-dimensional subspace of $\mathbb{R}^3$, e.g. $\mathbb{R}^2\simeq \mathbb{R}^2\times0 \subset \mathbb{R}^3$.
Apr
22
answered Identifying compositions of reflections, and rotations in a hexagon
Apr
22
comment Translation or rotation? Identify $R_{C,-120} \circ R_{B,-60} \circ R_{A,-180}$
@Mark You might also want to check this math.stackexchange.com/questions/1225042/…
Apr
22
comment Translation or rotation? Identify $R_{C,-120} \circ R_{B,-60} \circ R_{A,-180}$
@Mark With that picture of your $\angle(\Delta_1,\Delta_2)=60$ and therefore $S_{\Delta_2}\circ S_{\Delta_1}$ is equal to $R_{C,120}$ not $R_{C,-120}$. The only line containing $C$ and satisfying $\angle(\Delta_1,\Delta_2)=-60$ is the line through the point $A_1=S_{\Delta_1}(A)$.
Apr
22
comment Translation or rotation? Identify $R_{C,-120} \circ R_{B,-60} \circ R_{A,-180}$
@Mark Make sure your triangle is oriented clockwise.
Apr
21
answered Translation or rotation? Identify $R_{C,-120} \circ R_{B,-60} \circ R_{A,-180}$
Apr
20
answered Integrate $\frac{1}{1+\cos^2x}$. Probably need using some trigonometric identity I don't know
Apr
20
answered Evaluating a complex integral (Hints please)
Apr
20
answered $\lim_{n\rightarrow \infty}(3^n+7^n)^{1/n}$
Apr
20
answered Expanding a function
Apr
20
answered Continuity of metric function
Apr
20
comment Conditions for Laplace Transform
$$\mathscr{L}(1) (s)=\frac1s$$
Apr
20
revised Binomial theorem, verify ${\frac12 \choose n+1} = 1/(n+1){n-\frac12 \choose n}(-1)^n(1/2)$
added 16 characters in body; edited title