find the modulus of the complex number (1+i)2n+1 / (1-i)2n-1,n belongs to N

z=1+i2n+11-i2n-1, n=1+i2n×1+i1-i2n1-i-1, n=1+i2n×1+i×1-i1-i2n, n=1+i1-i2n×1-i2, n=21+i1-i×1+i1+i2n, n=21+2i+i21-i22n, n=22i22n, n=2i2n, n=2-1n, n=2-1n+0i, nz=2-1n2+02, n=4-12n, n=41 [Since, even power of -1 is equal to 1]=2

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