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\left(y^{2}+\frac{7}{3}\right)^{2}
Multiply y^{2}+\frac{7}{3} and y^{2}+\frac{7}{3} to get \left(y^{2}+\frac{7}{3}\right)^{2}.
\left(y^{2}\right)^{2}+\frac{14}{3}y^{2}+\frac{49}{9}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(y^{2}+\frac{7}{3}\right)^{2}.
y^{4}+\frac{14}{3}y^{2}+\frac{49}{9}
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
\left(y^{2}+\frac{7}{3}\right)^{2}
Multiply y^{2}+\frac{7}{3} and y^{2}+\frac{7}{3} to get \left(y^{2}+\frac{7}{3}\right)^{2}.
\left(y^{2}\right)^{2}+\frac{14}{3}y^{2}+\frac{49}{9}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(y^{2}+\frac{7}{3}\right)^{2}.
y^{4}+\frac{14}{3}y^{2}+\frac{49}{9}
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.