$4x-2=x+10$

$\lim_{x\to0}\left(\frac{9xe^x}{e^x-1}\right)$

$\int ( 12 x ^ { 2 } + 4 ) ( 4 x ^ { 3 } + 4 x - 8 ) ^ { 3 } d x$

$\int\frac{8x}{49x^2-36}dx$

$cosecx\left(cosecx-cotx\right)$

$\frac{a^2-11a+18}{a-9}$

$\lim_{x\to-\pi}\left(\frac{9\cos\left(x+9\right)}{\left(x+\pi\right)^2}\right)$