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Mathematics
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sayan
  • Member for 8 years, 5 months
  • Last seen more than 2 years ago
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3
What are some good books on algebraic inequalities?
Apr 22, 2016
2
None of $3,5,7$ can divide $r^4+1$
Apr 15, 2016
2
Is it true: $3k^2+1$ is a perfect square if and only if $k=1$ or $4$
Apr 16, 2016
2
How do I show that $\frac {a^2}b + \frac {b^2}c + \frac {c^2}a \ge \frac {(a + b + c)(a^2 + b^2 + c^2)}{ab + bc + ca}?$
Apr 17, 2016
2
Lucas numbers proof
Apr 17, 2016
2
How to prove that $n! = n^n - C_{n,1} (n-1)^n +C_{n,2} (n-2)^n - \cdots $?
Apr 20, 2016
1
Finding the range of a $y=-x^2(x+5)(x-3)$ without calculus?
Apr 15, 2016
1
Find the area between the curve $y = \cos x$ between the points $x = 0$ and $x = \pi$
Apr 16, 2016
1
Prove that $40\mid 3^{4N}-1$
Apr 16, 2016
1
How many subsets of four numbers from the set are there in which the sum of the largest and smallest number in the subset is 15?
Apr 17, 2016