$\frac{d^2}{dx^2}\left(e^{x^3}\right)$

$\int\frac{\cos^2x}{\sec x}dx$

$9z+8zy^2-5xz+zy^2-15xy^2$

$\frac{1}{2}\frac{du}{dx}+\frac{2}{x}u=\frac{1}{x^2}$

$-\left|-7\right|=-8$

$\frac{\tan\theta}{\cos\theta-\sec\theta}=-\csc\theta$

$\int\left(x^3+3x-1\right)\ln\left(x\right)dx$