Back to Practicehard • Past Paper

Factorize a^4 + 1/a^4 + 1.

A(a^2 + 1/a^2 + 1)(a^2 + 1/a^2 - 1)

B(a^2 + 1/a^2 + 1)^2

C(a^2 - 1/a^2 + 1)(a^2 + 1/a^2 - 1)

D(a^2 + 1/a^2)^2 - 1