The wavefunction of a 1 – D harmonic oscillator between $x=+\infty$ and $x=-\infty$ is given by $\psi(x)=N(2x^2-1)e^{-x^2/2}$. The value of $N$ that normalizes the function $\psi(x)$ is: $\left(\text{Given }\int_{-\infty}^{+\infty}x^{2n}e^{-x^2}\,dx=\frac{1\cdot3\cdot5\cdots(2n-1)}{2^n}\sqrt{\pi}\right)$