Question: ( begin{array}{l}f(x)=7 x cos left(frac{1}{2} x^{2} ight) sum_{n=0}^{infty}(quad) end{array} )
\\( \\begin{array}{l}f(x)=7 x \\cos \\left(\\frac{1}{2} x^{2}\ ight) \\\\ \\sum_{n=0}^{\\infty}(\\quad) \\\\\\end{array} \\)
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