$2a+2\sqrt{a}\sqrt{a+1}-1$

$-2x+7<3x-18$

$\sin\left(x\right)\cos\left(y\right)=\frac{3}{4};\cos\left(x\right)\sin\left(y\right)=\frac{1}{4}$

$\frac{d^2}{dx^2}\left(\frac{8x+13}{15x^2+7}\right)^6$

$2\left(\frac{6}{5}q^2\right)\left(-9y\right)$

$\frac{x^2+8x+11}{x+5}$

$\lim_{x\to\infty}\left(\frac{e^{2x}}{1+e^x}\right)$