Zadan je niz (an)n∈N0(a_n)_{n\in \mathbb{N}_0}(an)n∈N0 takav da je a0=aa_0 = aa0=a, a1=ba_1 = ba1=b, gdje su aaa, b∈Rb\in \mathbb{R}b∈R, i
an=an−1+an−2,n≥2.a_n = a_{n-1} + a_{n-2}, \quad n \geq 2.an=an−1+an−2,n≥2.
Odredite an2−an−1an+1a_n^2 - a_{n-1}a_{n+1}an2−an−1an+1.