User Penguino - Mathematics Stack Exchange

50 votes

Is it possible to rewrite $\sin(x) / \sin(y)$ in the form of $\sin(z)$?

answered Oct 17, 2016 at 0:46

4 votes

Accepted

Simple algorithm to get the square of an integer using only addition?

answered Oct 23, 2013 at 20:45

3 votes

Find $g(y-1)$ given $g(y)=y^2+2y+1$

answered Mar 10, 2015 at 23:58

3 votes

Accepted

Number of faces visible in different dimensions

answered May 23, 2016 at 0:23

3 votes

Accepted

Can this integral similar to $\int_{-\infty}^{\infty} \frac{\sin(x)}{x} dx$ be evaluated?

answered Apr 17, 2018 at 21:21

3 votes

Accepted

The distance between the centers of two circles K1 and K2 is 2cm. Determine the surface area of the figure that belongs to both circles.

answered Oct 24, 2018 at 22:15

3 votes

Accepted

Proving $(a\times b)+(b\times c)+(c\times a)$ is perpendicular to plane $ABC$

answered Jul 16 at 3:19

2 votes

What is the probability if I draw $1$ of $100$ different balls that this $1$ is one of $3$ predefined ones?

answered Jun 22, 2022 at 22:25

2 votes

Is it always possible to cut out a piece of the square with $\frac{1}{5}$ of its area?

answered Dec 12, 2022 at 20:53

2 votes

Accepted

Averaging values(they are angles) which are wrapping in o to 360

answered Aug 12, 2019 at 22:55

2 votes

Accepted

Conceptual understanding of calculus problem where water is being poured into a cylindrical can

answered Aug 23, 2020 at 22:39

2 votes

Why is $-\ln(\cos(x))$ equal to $\ln(\sec(x))$?

answered Nov 11, 2013 at 0:48

2 votes

Help in factoring polynomials

answered Sep 4, 2013 at 21:07

1 vote

Probability I lost when my friend told me I lost

answered Oct 16, 2013 at 20:24

1 vote

Calculating coordinates along a line based on two points on a 2D plane

answered Oct 22, 2013 at 20:23

1 vote

How to get equation for semilog graph

answered Aug 13, 2013 at 1:59

1 vote

Odds of getting the largest possible hand in blackjack

answered Aug 19, 2013 at 21:09

1 vote

Accepted

Finding the velocity vector

answered Nov 24, 2013 at 20:36

1 vote

Accepted

Probability, coin and table

answered Dec 1, 2013 at 22:44

1 vote

I have a question about Time taken based on different rates working together

answered Jan 27, 2014 at 21:49

1 vote

Accepted

experimental sequence of number

answered Nov 3, 2013 at 22:42

1 vote

Why does $\theta = 135$ degrees and not $45$ degrees?

answered Mar 11, 2018 at 23:26

1 vote

Finding the absolute maximum and minimum of a function in a disk?

answered May 23, 2018 at 23:09

1 vote

software for sketching derivatives from arbitrary functions drawn by hand

answered Sep 3, 2017 at 21:44

1 vote

Can a classical computer count beyond a finite number?

answered Oct 7, 2020 at 20:56

1 vote

Accepted

What is the smallest ball containing four non-adjacent vertices of a cube?

answered Nov 1, 2021 at 22:33

1 vote

Why does combining sinusoidal functions with the same frequency produce another sinusoidal function?

answered Mar 2, 2022 at 21:36

1 vote

Sum of squares of four consecutive primes

answered Mar 15, 2020 at 22:07

1 vote

Accepted

Probability of passing an exam given two different grading schemes

answered Aug 20, 2020 at 0:58

1 vote

find speed from object size growth in video

answered Feb 27, 2019 at 22:18

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60 Answers

Is it possible to rewrite $\sin(x) / \sin(y)$ in the form of $\sin(z)$?

Simple algorithm to get the square of an integer using only addition?

Find $g(y-1)$ given $g(y)=y^2+2y+1$

Number of faces visible in different dimensions

Can this integral similar to $\int_{-\infty}^{\infty} \frac{\sin(x)}{x} dx$ be evaluated?

The distance between the centers of two circles K1 and K2 is 2cm. Determine the surface area of the figure that belongs to both circles.

Proving $(a\times b)+(b\times c)+(c\times a)$ is perpendicular to plane $ABC$

What is the probability if I draw $1$ of $100$ different balls that this $1$ is one of $3$ predefined ones?

Is it always possible to cut out a piece of the square with $\frac{1}{5}$ of its area?

Averaging values(they are angles) which are wrapping in o to 360

Conceptual understanding of calculus problem where water is being poured into a cylindrical can

Why is $-\ln(\cos(x))$ equal to $\ln(\sec(x))$?

Help in factoring polynomials

Probability I lost when my friend told me I lost

Calculating coordinates along a line based on two points on a 2D plane

How to get equation for semilog graph

Odds of getting the largest possible hand in blackjack

Finding the velocity vector

Probability, coin and table

I have a question about Time taken based on different rates working together

experimental sequence of number

Why does $\theta = 135$ degrees and not $45$ degrees?

Finding the absolute maximum and minimum of a function in a disk?

software for sketching derivatives from arbitrary functions drawn by hand

Can a classical computer count beyond a finite number?

What is the smallest ball containing four non-adjacent vertices of a cube?

Why does combining sinusoidal functions with the same frequency produce another sinusoidal function?

Sum of squares of four consecutive primes

Probability of passing an exam given two different grading schemes

find speed from object size growth in video