Question

Помогите,пжл
Найти производные!
1)y=√x+√7
2)y=2x²/x³+3
3)y=x²cosx+xsinx

Answer 1

$left( sqrt{x}+ sqrt{7} right)'=frac{1}{2sqrt{x}}$
$left(frac{2x^2}{x^3+3} right)'=frac{4x(x^3+3)-6x^2cdot x^2}{(x^3+3)^2}=frac{12x-2x^4}{(x^3+3)^2}$