3. Factorise III

Factorise the following using the identity: \(a^2−b^2=(a+b)(a−b)\).
 
1. \(x^4−1\)
 
2. \(y^4−625\)
Answer variants:
\((x+1)(x−1)\)
\((y^2+25)(y^2+25)\)
\((y^2+25)(y^2−25)\)
\((x^2+1)(x^2−1)\)
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