7 номер......... а или б

[latex]a)f(x)= \sqrt[4]{x^3} + \frac{5}{x^2} - \frac{3}{x^3} +2[/latex] [latex]f'(x)= \frac{3}{4 \sqrt[4]{x} } - \frac{10}{x^3} + \frac{9}{x^4} [/latex] [latex]b)f(x)= \sqrt{sin(3x^2+1)} [/latex] [latex]f'(x)= \frac{6x*cos(3x^2+1)}{2 \sqrt{sin(3x^2+1)} } = \frac{3x*cos(3x^2+1)}{ \sqrt{sin(3x^2+1)} } [/latex]