please answer both if possible The Maclaurin series of the function \( f(x)=2 x^{2} \sin (9 x) \) can be written as \( f(x)=\sum_{n=0}^{\infty} c_{n} x^{n} \) where a few of the coefficients are: \[ \begin{array}{l} c_{3}= \\ c_{4} 2 answers