$\lim_{x\to\infty}\left(3+\frac{\sin\left(3x\right)}{2x}\right)$
$-44\:\cdot4$
$\frac{\sin\left(x\right)^2}{\left(1+\cos\left(x\right)\right)^2}=\left(\csc\left(x\right)-\cot\left(x\right)\right)$
$25n^2-121m^2$
$\left(5x^2-3y^3\right)\left(5x^2+3y^3\right)$
$3\left(5z+2y\right)$
$126.9-53$
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