Question: Let \(f\left( x,y \right)=3{{x}^{2}}+3{{y}^{2}}-6x-18y+\pi \) and let \(\mathbf{v}=\left( 2\,mm,31-dd \right)\) such that \(mm\) is the month and \(dd\) is the day of your date of birth. Find the derivative of f at the point \(Q\left( 1,3,\pi -30 \right)\) in the direction of \(\mathbf{v}\).