Question

y = m-x/ m+x нужно найти производную

Answer 1

$\frac{ \frac{d}{dx} (m - x)(m + x) - (m - x) \times \frac{d}{dx} (m + x)}{(m + x) {}^{2} } \\ \frac{ - 1(m + x) - (m - x) \times 1}{(m + x) {}^{2} } \\ - \frac{2m}{(m + x) {}^{2} }$