$e^{2t}cos^2t-cos^2t-e^{2t}$
$\lim_{x\to\infty}\:\frac{3x}{\sqrt{\left(x\right)^3\:+\:2}}$
$\lim_{x\to0}\left(x^2-15x-50\right)^{20}$
$6-2x=10$
$48=56+8b$
$\left(-x^2+2x\right)^2-\left(-4\sqrt{x}\right)^2$
$-3x^2\cdot y^6\cdot\frac{m^2}{4}-9x^4\cdot y^{12}$
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