Упростите выражение:
[tex] \frac{ a^{2}-b^{2}}{ a^{4}-b^{4}}+ \frac{a}{ a^{2}+ b^{2} } [/tex]
[tex] \frac{ a^{2}-b^{2}}{ a^{4}-b^{4}}+ \frac{a}{ a^{2}+ b^{2} } [/tex]
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1/(a²+b²) + a/(a²+b²)=(1+a)/(a²+b²)