$\left(9ab-16\right)\left(5ab+3\right)\left(24ab+11\right)$
$\lim_{x\to\infty}\left(\sqrt{x^2-2bx+a}-\sqrt{x^2-2cx+d}\right)$
$\left(cos2x-1\right)^2=1$
$\left(9x\:+\:1\right)^2$
$\frac{x^4}{x^2+9}$
$\frac{1}{81}\cdot2y^4-\frac{16}{121}a^2b^6$
$-11.7+3.4-85.4$
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