$\lim_{x\to\infty}\left(\frac{2x+3}{x-2}\right)$

$\int\left(2t-\cos\left(6t\right)\right)dt$

$+4.2+3.1-2.6+1.8-3.7+0.5-1.4-1.8+1.5+3.6+2.4-1.7+2.5+2.7-3.2$

$\frac{15a^{2}b^{2}-5a^{5}b^{6}}{5a^{2}b^{2}}$

$2^1-\left(-1\right)^4$

$\left(4s+5\right)\left(4s-5\right)$

$\left(10m-2n\right)^2$