Take the logarithm of both sides:
\[ \ln y = x \ln x. \]Differentiate with respect to \( x \):
\[ \frac{1}{y} \frac{dy}{dx} = \ln x + 1. \]Multiply through by \( y = x^x \):
\[ \frac{dy}{dx} = x^x (\ln x + 1). \](b) Order of the differential equation: $ 5x^3 \frac{d^3y}{dx^3} - 3\left(\frac{dy}{dx}\right)^2 + \left(\frac{d^2y}{dx^2}\right)^4 + y = 0 $
The differential coefficient of the \( \sin(x^2 + 5) \) with respect to \( x \) will be: