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    7. A :
    \[f\left( x \right)=a{{x}^{3}}+b{{x}^{2}}\]
    a , b .

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    8. C1 :
    \[2\le y\le 4\]

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    9. c1 ( 0 , 3- )
    ; 10-04-2016 12:10 AM

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    10. C1
    \[y\cdot {y}'''+3{y}'\cdot {y}''=0\]

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    11. C1
    \[{{y}^{3}}\cdot {y}''-3=0\]











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    12. C1 = | 2i -| .

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