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1)[tex] \frac{4}{3\3a-1} \frac{3}{1- 9a^{2} } \frac{2}{1+3a } [/tex]
2) [tex] \frac{5}{ a^{3}+1 } \frac{2a+3}{1-a- a^{2} } [/tex]
3)[tex] \frac{x-1}{x^2-8x+16} \frac{x+2}{16-x^2} [/tex]
4)[tex] \frac{2-x}{25+10x+x^2} \frac{1+x}{50-2x^2} [/tex]
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