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1)[tex] \frac{28^{5} }{4^{5}* 7^{4} } =[/tex]
2)[tex] \sqrt{x+2} =x[/tex]
3)[tex] \frac{x}{2 a^{2}-ax}- \frac{4a}{2ax- x^{2} } [/tex]
4)[tex] x^4-34 x^{2}=- x^{4}-32 [/tex]
5)[tex] \frac{sin ^{2}a-4sin ^{2}a }{sin^{2}2a +4sin^{2}a-4 } [/tex]

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