Skip to main content
DanDan面's user avatar
DanDan面's user avatar
DanDan面's user avatar
DanDan面
  • Member for 4 years, 9 months
  • Last seen this week
6 votes
Accepted

Why does Desmos outlines $r=\cos(2\theta)$ differently from $r\le\cos(2\theta)$?

4 votes
Accepted

How is the approximation $\sqrt{k+1} - \sqrt{k}\approx \frac{1}{2\sqrt{k}}$ done?

4 votes
Accepted

how to make the graph of $1/x$ pass through $(1, 0)$ and $(0, 1)$?

3 votes
Accepted

Kronecker product of diagonal matrices

1 vote
Accepted

Probability puzzle app: conditional probability

1 vote
Accepted

Finding minimum of geometric sequence

1 vote
Accepted

Find $x$ for $3 \sec x \tan x - 4 \csc x \cot x = 0$

1 vote
Accepted

Picking random points inside sphere, with linear density

1 vote
Accepted

Moment of normal distribution (Iproof by induction)

1 vote

Determining values of $n$ for which the real part of a complex number is $0$

0 votes
Accepted

How should I show that this integral is 0?

0 votes
Accepted

Variable $(X, Y)$ has Gaussian distribution and a given covariance matrix. Find $a$ such that the variables $X +Y$ and $X +aY$ are independent.

0 votes
Accepted

Find the upper bound $c_1$ and lower bound $c_2$ so that $ \int_{c_1}^{c_2} f(x)dx=\int_{c_1}^{c_2} g(x)dx $

0 votes
Accepted

How is this change possible?