• ### How can I show A/B = 1 where A= 1+ 4cos(2š/7) and B=4(cos(2š/7))^2 + 8(cos(2š/7))^3?

1 answer · Mathematics · 3 days ago
• ### What is the area of the region defined by these inequalities?

What is the area of the region defined by these inequalities: y - 3<=4 (x - 2) and 4 (y - 7)<=3 (x - 3) and -3 (y - 10)<=-8 (x - 7) and -2 (y - 2)<=x - 4
What is the area of the region defined by these inequalities: y - 3<=4 (x - 2) and 4 (y - 7)<=3 (x - 3) and -3 (y - 10)<=-8 (x - 7) and -2 (y - 2)<=x - 4
Mathematics · 5 months ago
• ### Pi in base 12 starts out 3.1848. Is this more or less accurate than the base 10 value 3.1416?

6 answers · Mathematics · 7 months ago
• ### The sum of two rational numbers is 6049/330 and their product is 84. What is their difference.?

1 answer · Mathematics · 8 months ago
• ### Is there a way to block an anonymous person?

I go to a lot of trouble to answer questions of a certain person who is anonymous, only to find that I cannot post the answer. Apparently, that person has blocked me. It would be really nice if I never saw his questions, so I did not waste my time typing in an answer only to have it not post. Is there a way I can accomplish this?
I go to a lot of trouble to answer questions of a certain person who is anonymous, only to find that I cannot post the answer. Apparently, that person has blocked me. It would be really nice if I never saw his questions, so I did not waste my time typing in an answer only to have it not post. Is there a way I can accomplish this?
• ### What is 4 cos^4(x) + 4 sin^4(x) - cos(4x) after simplification?

3 answers · Mathematics · 10 months ago
• ### How to derive the solutions (a,b,c) = (r^2-s^2, r^2-2rs, s^2-rs+r^2) to the Diophantine equation a^2-ab+b^2=c^2?

1 answer · Mathematics · 10 months ago
• ### If I repeatedly get the message "We are experiencing some problems, please try again" does it mean person asking the question has blocked me?

4 answers · Notices and Errors · 11 months ago
• ### Is it true that for every positive integer k, the sum n=0 to infinity of 1/(kn)! is greater than 1?

1 answer · Mathematics · 11 months ago
• ### What is the sum from n=1 to ā of (-1)^(n+1) Ļ^(2n) / (2n+1)!?

2 answers · Mathematics · 11 months ago
• ### How can I find out?

I have had 3 violations in 10 days, but I have no idea which questions, nor which answers. The email I get does not say. When I try to appeal it says I am on the wrong user id, but this is the only one I use for Y!A. Is there some way to find out what I did wrong?
I have had 3 violations in 10 days, but I have no idea which questions, nor which answers. The email I get does not say. When I try to appeal it says I am on the wrong user id, but this is the only one I use for Y!A. Is there some way to find out what I did wrong?
Notices and Errors · 1 year ago
• ### How to show that for each integer nā„0, 1+10^(231+462n) is divisible by the squares of at least two different primes?

1 answer · Mathematics · 1 year ago
• ### Is it true that for every positive integer n, the integer 1+10^(22n-11) is divisible by 11^2?

If so how do you prove it?
If so how do you prove it?
1 answer · Mathematics · 1 year ago
• ### Do neutrons ever split into protons and electrons?

I recently read that neutron stars form when great pressure causes protons and electrons to coalesce and become neutrons. Does the opposite ever occur?
I recently read that neutron stars form when great pressure causes protons and electrons to coalesce and become neutrons. Does the opposite ever occur?
2 answers · Physics · 1 year ago
• ### A circle is tangent to both lines 3x-4y+4=0 and 6x-8y-12=0 and to the x-axis. What is its area and the coordinates of its center?

If there is more than one such circle, find all areas and centers.
If there is more than one such circle, find all areas and centers.
3 answers · Mathematics · 1 year ago
• ### If n is positive integer then 2n^4 - 41n^3 + 18n^2 + 63n + 23, 40n^4 - 89n^3 + 64n^2 + 99n + 57 are not both prime. Proof or counterexample?

2 answers · Mathematics · 1 year ago
• ### How long to factor the positive integer 7 969573 645636 172367 606393 692101 343801 072290 291424 600054 301455 452981 812190 477155 341797?

With modern factoring methods on a computer, about how long (these days) would it take to factor the 85 digit positive integer given above. (Spaces are for readability only).
With modern factoring methods on a computer, about how long (these days) would it take to factor the 85 digit positive integer given above. (Spaces are for readability only).
1 answer · Mathematics · 1 year ago
• ### Does the integral shown in the picture equal one half?

2 answers · Mathematics · 1 year ago
• ### What would be a differential equation whose solutions include the parabolas in the picture?

2 answers · Mathematics · 1 year ago
• ### What is the minimum distance between the graph of y=101x^6 and the graph of y=404x^2-311?

2 answers · Mathematics · 1 year ago