Mathematics
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Kostiantyn Lapchevskyi
  • Member for 5 years, 10 months
  • Last seen more than a month ago
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All Questions Answers
Score Newest
answer
6
Number of roots of $x^4 + x^3 \sin(x) + x^2 \cos(x) = 0$
Sep 15, 2016
answer
5
How to prove that there exist $a$ and $b$ in [0,1] such that $\left| f\left( a \right) +g\left( b \right) -ab \right| \ge \frac { 1 }{ 4 } $?
Sep 30, 2016
answer
5
How does one algebraically solve the wave equation (PDE)?
Sep 30, 2016
question
4
System of differential equations. Recurrence relation.
Aug 15, 2016
answer
3
Is there a closed form of $(\frac{1}{3!}-\frac{1}{4!})+\frac{2}{6!}-(\frac{4}{7!}-\frac{4}{8!})-\frac{8}{10!}...$
Aug 15, 2016
answer
3
What's my mistake in this integration??? $\int \sqrt{3-2x-x^2} dx$
Sep 15, 2016
answer
3
Sum of fourth powers in terms of sum of squares
Oct 2, 2016
answer
3
Properties of differential equation without solving the equation
Oct 12, 2016
answer
3
Real domain and range function to find all functions with nonzero x.
Oct 14, 2016
answer
3
Calculate limit involving $\sin$ function
Oct 15, 2016

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