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Mar
11
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Feb
24
awarded  Popular Question
Feb
5
reviewed Leave Open How does computing the determinant of a matrix with unit vectors give you the Cross Product?
Feb
5
reviewed Leave Open Why is that if $z^n = |z|^2$, then $|z| = 1$?
Jan
27
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Jan
23
comment How do I prove: $\cos (\theta + 90^\circ) \equiv - \sin \theta $
@user3788135 $\cos (\theta +90^{\circ})<0 $ and $\cos (\theta+90^{\circ})=-|OB|/|OQ|=-|OB|/1=-|OB|$.
Jan
21
revised Changing polar coordinates: Calculating $\iint_R\dfrac{dxdy}{\sqrt{x^2+y^2}}$ where $R=\{(x,y):1\leq x^2+y^2\leq 2, x\leq0, y\geq0\} $
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Jan
21
revised Continued fraction and order of a real number
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Jan
21
revised Proving $x = y$ or $x = -y$ when $x^n = y^n$ and $n$ is even
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Jan
20
revised Prove that the integral of $\frac{dx}{\sqrt{x-x^2}}$ is equal to $2\sin^{-1}\sqrt x+C$ using $u = \sqrt{x}$.
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Jan
18
revised Proving $x = y$ or $x = -y$ when $x^n = y^n$ and $n$ is even
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Jan
18
revised Proving $x = y$ or $x = -y$ when $x^n = y^n$ and $n$ is even
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Jan
5
answered Proving $x = y$ or $x = -y$ when $x^n = y^n$ and $n$ is even
Dec
29
reviewed Leave Open Prove that the function is bijection
Dec
26
awarded  Nice Answer
Dec
17
revised How do I find the maximum volume for a box when the corners are cut out?
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Dec
17
revised How do I find the maximum volume for a box when the corners are cut out?
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Dec
16
revised How do I find the maximum volume for a box when the corners are cut out?
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