Question

Найдите производные заданных функций.

Answer 1

$1)\ \ \displaystyle y=\frac{x^3-8}{\sqrt{x^2+3x-1}}\\\\\\y'=\frac{3x^2\cdot \sqrt{x^2+3x-1}-(x^3-8)\cdot \dfrac{2x+3}{2\sqrt{x^2+3x-1}}}{(\sqrt{x^2+3x-1})^2}=\\\\\\=\frac{6x^2\cdot (x^2+3x-1)-(x^3-8)\cdot (2x+3)}{2\sqrt{x^2+3x-1}\cdot (x^2+3x-1)}=\frac{4x^4+15x^3-6x^2+16x+24}{2\sqrt{(x^2+3x-1)^3}}$

$2)\ \ \displaystyle y=\Big(5^{arctg3x}+ctg\frac{x}{2}\Big)^4\\\\\\y'=4\Big(5^{arctg3x}+ctg\frac{x}{2}\Big)^3\cdot \Big(5^{arctg3x}\cdot ln5\cdot \frac{1}{1+9x^2}-\frac{1}{2\, sin^2\frac{x}{2}}\Big)$

$3)\ \ \displaystyle y=\sqrt{a^2+x^2}-a\cdot arccos\frac{x}{a}\\\\\\y'=\frac{1}{2\, \sqrt{a^2+x^2}}\cdot 2x+a\cdot \frac{1}{\sqrt{1-\frac{x^2}{a^2}}}\cdot \frac{1}{a}=\frac{x}{\sqrt{a^2+x^2}}+\frac{a}{\sqrt{a^2-x^2}}$