$16x^2-16x+4$
$\int_a^b\left(\frac{1}{x^2+4x+9}\right)dx$
$\sqrt{7^2}\cdot5^2$
$\int15x^4e^{x^5}dx$
$\left(7x^4+9y^3\right)\left(7x^4-9y^3\right)$
$\frac{3b}{10b^3}$
$\frac{60-4\sqrt[2]{15}}{15-\sqrt{15}}$
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