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Question Number 176347 by cortano1 last updated on 16/Sep/22

$${(2+\frac{1}{4}{\mathrm{x}}^2)}^5{(2-\frac{1}{3}{\mathrm{x}}^2)}^5$$$$\mathrm{find}\mathrm{coefficient}{\mathrm{x}}^2$$

Answered by mr W last updated on 16/Sep/22

$$5\times \frac{1}{4}\times 2^4\times 2^5+5\times (-\frac{1}{3})\times 2^4\times 2^5$$$$=-\frac{640}{3}$$

Commented by cortano1 last updated on 16/Sep/22

$$\mathrm{thanks}\mathrm{sir}$$

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