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\left(\frac{3}{4}\right)^{2}-\left(4y\right)^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
\frac{9}{16}-\left(4y\right)^{2}
Calculate \frac{3}{4} to the power of 2 and get \frac{9}{16}.
\frac{9}{16}-4^{2}y^{2}
Expand \left(4y\right)^{2}.
\frac{9}{16}-16y^{2}
Calculate 4 to the power of 2 and get 16.
\left(\frac{3}{4}\right)^{2}-\left(4y\right)^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
\frac{9}{16}-\left(4y\right)^{2}
Calculate \frac{3}{4} to the power of 2 and get \frac{9}{16}.
\frac{9}{16}-4^{2}y^{2}
Expand \left(4y\right)^{2}.
\frac{9}{16}-16y^{2}
Calculate 4 to the power of 2 and get 16.