$\frac{d^2}{dx^2}\frac{\left(x+1\right)^2}{\left(x-1\right)}$

$\frac{4x^2+3x+2}{x-3}$

$\left(4cos\theta\:-2sin\theta\:\right)^2+\left(2cos\theta\:+4sin\theta\:\right)^2=20$

$\arctan\left(\tan\left(\frac{4\pi}{5}\right)\right)$

$2x^7+5x^2$

$3a^2;\:a=1.7$

$ln\frac{11p^2}{y}$