$( 3 x + 8 ) ( 3 x - 10 )$

$\int\frac{e^3x}{1+e^3x}dx$

$18\cdot4+18-\left(-2\right)+11$

$\frac{sin\left(\frac{\pi}{4}+a\right)-cos\left(\frac{\pi}{4}+a\right)}{sin\left(\frac{\pi\:}{4}+a\right)+cos\left(\frac{\pi\:}{4}+a\right)}$

$\lim_{x\to0}\left(\frac{ln\left(sinx\right)}{\left(\pi-2x\right)^2}\right)$

$\left(\frac{3}{2x}+1\right)\left(\frac{3}{2x}-1\right)$

$4x+\left(5y-3x\right)$