$\frac{\csc\left(x\right)}{\cot\left(x\right)\tan\left(x\right)}=\cos\left(x\right)$

$y^2+16y-80$

$3 ^ { 4 } \times 3 ^ { - 3 }$

$\lim_{x\to4}\left(\frac{x^2+x-12}{x-4}\right)$

$\int\frac{1}{\left(z^2-2z+5\right)}dz$

$1-5x<-9\:$

$\left(3cos\left(x\right)-1\right)\left(2cos\left(x\right)+15\right)$