User zahbaz

71 votes

Accepted

Cardioid in coffee mug?

calculus polar-coordinates

answered Nov 28, 2015 at 22:03

51 votes

Apparently sometimes $1/2 < 1/4$?

answered Mar 28, 2017 at 2:10

40 votes

How many scientists can survive?

combinatorics puzzle

answered Apr 20, 2015 at 5:42

38 votes

What does a triple integral represent?

multivariable-calculus

answered Apr 18, 2016 at 1:30

30 votes

How do you compute negative numbers to fractional powers?

exponentiation

answered Mar 11, 2016 at 9:11

28 votes

Why can a quadratic equation have only 2 roots?

algebra-precalculus polynomials roots quadratics

answered Dec 9, 2016 at 5:26

28 votes

Limit of a sequence of integrals involving continued fractions

calculus limits definite-integrals continued-fractions

answered Nov 19, 2018 at 7:29

20 votes

There are 4 cups of liquid. Three are water and one is poison. If you were to drink 3 of the 4 cups, what is the probability of being poisoned?

probability

answered May 14, 2018 at 8:32

17 votes

Accepted

1 to the power of infinity formula

calculus limits

answered Oct 27, 2016 at 7:18

14 votes

Which binds first, product or factorial?

notation factorial products

answered Apr 29, 2018 at 6:18

13 votes

Limits of cosine and sine

limits trigonometry

answered Aug 26, 2015 at 6:24

10 votes

Accepted

How to remember trig identities?

trigonometry mnemonic

answered Jul 9, 2015 at 6:02

9 votes

Much less than, what does that mean?

inequality soft-question notation

answered Nov 10, 2015 at 19:00

8 votes

Accepted

Logical fallacy that suggests $3/9=3/10$

decimal-expansion

answered Jun 6, 2018 at 2:22

7 votes

Why is negative times negative = positive?

abstract-algebra algebra-precalculus arithmetic education faq

answered Nov 9, 2015 at 8:08

7 votes

How to derive the value of $\log(-1)$?

complex-analysis complex-numbers logarithms

answered Oct 11, 2015 at 3:42

6 votes

Show that $y =e-x^2e^x$ has an $x$-intercept at $x = 1$

algebra-precalculus

answered Apr 24, 2017 at 8:35

6 votes

How to find length of a part of a curve?

calculus limits functions

answered Feb 4, 2017 at 18:51

6 votes

I think I can complete the square of any quadratic, is it true? (Any reason to ever use Quad. Formula?)

algebra-precalculus quadratics completing-the-square

answered May 31, 2015 at 22:04

6 votes

Wrong calculation by a calculator

calculator

answered Apr 27, 2016 at 4:40

6 votes

What does "Mathematics of Computation" mean?

education math-history computational-mathematics foundations

answered Feb 20, 2016 at 6:35

5 votes

Derivative of $f(x)=e^7+\ln(4)$.

calculus derivatives

answered Feb 20, 2017 at 6:29

5 votes

Where does the $-2ab$ term come from in the cosine law?

geometry trigonometry triangles

answered Oct 22, 2017 at 7:17

5 votes

Definite integral $\int_0^\infty e^{-y}e^{-xy}y^2dy$

calculus integration

answered Jan 23, 2019 at 21:29

5 votes

Does the order of operations matter with just addition and subtraction?

arithmetic

answered Nov 14, 2015 at 22:14

5 votes

Qualitatively, what is the difference between a matrix and a tensor?

linear-algebra mathematical-physics tensors

answered Sep 21, 2015 at 2:11

4 votes

Accepted

Find Value of $g'(0)$ if $g(x)$ is inverse of $f(x)$, where $f(x)=\int_{2}^{x}\frac{1}{\sqrt{(1+t^4)}}dt$.

definite-integrals

answered Sep 16, 2018 at 21:39

4 votes

Why in some problems we round up and in some problems we round down?

algebra-precalculus intuition

answered Sep 9, 2017 at 4:49

4 votes

von Neumann entropy and change of basis

matrices mathematical-physics entropy

answered Aug 13, 2018 at 18:21

4 votes

Accepted

Quickest way to find coefficient of trinomial

multinomial-coefficients multinomial-theorem

answered Mar 5, 2017 at 20:23

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271 Answers

Cardioid in coffee mug?

Apparently sometimes $1/2 < 1/4$?

How many scientists can survive?

What does a triple integral represent?

How do you compute negative numbers to fractional powers?

Why can a quadratic equation have only 2 roots?

Limit of a sequence of integrals involving continued fractions

There are 4 cups of liquid. Three are water and one is poison. If you were to drink 3 of the 4 cups, what is the probability of being poisoned?

1 to the power of infinity formula

Which binds first, product or factorial?

Limits of cosine and sine

How to remember trig identities?

Much less than, what does that mean?

Logical fallacy that suggests $3/9=3/10$

Why is negative times negative = positive?

How to derive the value of $\log(-1)$?

Show that $y =e-x^2e^x$ has an $x$-intercept at $x = 1$

How to find length of a part of a curve?

I think I can complete the square of any quadratic, is it true? (Any reason to ever use Quad. Formula?)

Wrong calculation by a calculator

What does "Mathematics of Computation" mean?

Derivative of $f(x)=e^7+\ln(4)$.

Where does the $-2ab$ term come from in the cosine law?

Definite integral $\int_0^\infty e^{-y}e^{-xy}y^2dy$

Does the order of operations matter with just addition and subtraction?

Qualitatively, what is the difference between a matrix and a tensor?

Find Value of $g'(0)$ if $g(x)$ is inverse of $f(x)$, where $f(x)=\int_{2}^{x}\frac{1}{\sqrt{(1+t^4)}}dt$.

Why in some problems we round up and in some problems we round down?

von Neumann entropy and change of basis

Quickest way to find coefficient of trinomial