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MCCCS
  • Member for 5 years, 11 months
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21 votes

Proofs of the Cauchy-Schwarz Inequality?

15 votes

The staircase paradox, or why $\pi\ne4$

10 votes

If nine coins are tossed, what is the probability that the number of heads is even?

8 votes

Derivative of absolute function

6 votes

Filling $4 \times 4$ matrix with Boolean values

6 votes
Accepted

How many squares in a rectangle?

6 votes

Does $150$% chance exist?

6 votes
Accepted

Last digit of $3^ {29}+11^{12}+15$

4 votes

Why does the discriminant in the Quadratic Formula reveal the number of real solutions?

4 votes

What are some mathematically interesting computations involving matrices?

4 votes

Is there a way to get trig functions without a calculator?

3 votes

When all of $n-2$, $n+2$, $n^2-2$, and $n^2+2$ are primes?

3 votes

Can someone give a proof for this hyperbolic rule

3 votes
Accepted

intersection of circle and lines ? $1$

3 votes
Accepted

How would I find the values of $x$ and $y$ for which $A^2=A$

2 votes

$ 0=1 $ ? Where is the mistake?

2 votes

Help solving a system (kinda) with modular arithmetic

2 votes

Integral $\int \frac{9-e^{x}}{e^{8x}}dx$

2 votes

Algebraic identities

1 vote

What is the value of the expression $\sin\frac{2\pi}{7}\sin\frac{4\pi}{7}+\sin\frac{4\pi}{7}\sin\frac{8\pi}{7}+\sin\frac{8\pi}{7}\sin\frac{2\pi}{7}$?

1 vote

Find out |a+p+b+q| for the following question.

1 vote

If $\tan A=-\frac 1 2$ and $\tan B =-\frac 1 3$, then $A+B =?$

1 vote

To prove $n\binom{2n-1}{n-1}$ is divisible by $n(2n-1)$

1 vote

How I show that $\frac{3^{25}+1}{2}$ is an even number.?

1 vote

$12x \equiv 33 \pmod{57}$

1 vote

Compute $\sum\limits_{k+l=0}^{97}\binom{100}{k}\binom{100-k}{l}\binom{100-k-l}{97-k-l}$

1 vote
Accepted

Formula for calculating profit

1 vote

Show that if $n ≡ 7 \pmod{12}$ then $n ≡3\pmod 4$

1 vote
Accepted

How to solve this quadratic equation?

1 vote

Proving trigonometric identity $\cos^6A+\sin^6A=1-3 \sin^2 A\cos^2A$