3. Expand using identities.
![[ \frac{1}{4}b + \frac{1}{3}c {]}^{2} [ \frac{1}{4}b + \frac{1}{3}c {]}^{2}](https://tex.z-dn.net/?f=%5B+%5Cfrac%7B1%7D%7B4%7Db+%2B++%5Cfrac%7B1%7D%7B3%7Dc+++%7B%5D%7D%5E%7B2%7D+)
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solves....check it......
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