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Знайти диференціал другого порядку функції \fontsize{3} y=4xsin \frac{x}{2}
\fontsize{3} d^2y=(4 cos {\frac{x}{2}} - xsin \frac{x}{4})dx^2
\fontsize{3} d^2y=(4cos {\frac{x}{2}} - xsin\frac{x}{2})dx^2
\fontsize{3} d^2y=(4 cosx - xsinx)dx^2
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