$\lim_{x\to\infty}\left(\frac{e^{ax}-1}{\sqrt{xe}}-e^a\right)$

$\frac{\cos\:\left(y\right)}{\sec\:\left(y\right)+\tan\:\left(y\right)}$

$csc^{\left(2\right)}x\left(sec^2x-1\right)=\frac{1}{cos^2x}$

$\frac{4x^7+7x^4+5^2-10}{x^5}$

$16y-20$

$48a^6-36a^3c^2-a^4c^3$

$-7b-1b$