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• 13 How to calculate $ \left| \sin x \right| $ derivative in a more elegant way?
• 11 Calculate the determinant of $n^\text{th}$ order
• 11 Solving $\cos(z) = \frac{5}{2}$
• 7 Can one deduce that $P(x)$ is a polynomial of degree $0$ or $1$ from the following condition
• 7 If $\log_8 3 = P$ and $\log_3 5 = Q$, express $\log_{10} 5$ in terms of $P$ and $Q$.
• 7 If $A$ is an orthogonal matrix with $|A|=-1$, show that $|I-A|=0$
• 6 Show that all terms of this sequence are integers.
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