Verify that x2n−1=(xn−1)(xn+1)x^{2n} - 1 = (x^n - 1)(x^n + 1)x2n−1=(xn−1)(xn+1) for any positive integer nnn.
True, by expanding the right side
Cannot be verified
False, only true for n=1n=1n=1
Only true for even nnn