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y=1−(2x)22!+(2x)44!−(2x)66!+…\large y = 1 - \frac{(2x)^2}{2!} + \frac{(2x)^4}{4!} - \frac{(2x)^6}{6!} + \ldotsy=1−2!(2x)2+4!(2x)4−6!(2x)6+…
Find d2ydx2\dfrac{d^2y}{dx^2}dx2d2y at x=πx = \pix=π.
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