$\left(3x^2-y\right)^4$

$\lim_{x\to n}\left(\frac{x+4n}{x^2}\right)$

$\int e^{a\cdot e^x}dx$

$6\log\left(w\right)-.5\log\left(z\right)+7\log\left(x\right)$

$2x^5-4x^3+6x^2-7x$

$\left(2x-3y\right)-4\left(x-5y\right)\:$

$\frac{\sec^2\left(x\right)-1\:+\left(\sec\left(x\right)+\cos\left(x\right)\right)\sec\left(x\right)}{\sec\left(x\right)\tan\left(x\right)}=0$