New posts in Algebra Precalculus

Combinatorics - Painting the Unit Squares of a 3x3 Square

How many ways to read the palindromic word ROTATOR in this design?

What is my mistake in this determinant of order $n$?

How do I prove this trigonometry inequality $\sin^2(y) \leq 2 \sin^2(x) + 2\sin^2(y-x)$?

Solve $\begin{cases}x^2+y^4=20\\x^4+y^2=20\end{cases}$

Prove that $\left \lfloor \frac{1+\lfloor na+1/a\rfloor}{a} \right \rfloor=n$

Is there a way to show $\frac{1646-736\sqrt{5}}{2641-1181\sqrt{5}}=\frac{17+15\sqrt{5}}{7+15\sqrt{5}}$ without multiplying large numbers?

The formulas of prostapheresis: memorization technique

If $x,y∉ℚ$ and $x^2-y^2∈ℚ_{≠0}$ then $x+y,x-y∉ℚ$?

Area bounded by $2 \leq|x+3 y|+|x-y| \leq 4$