$$3\:tan\:x\:+\:2\:sec\:x$$

$$\frac{\left(cos\left(z\right)-1+\frac{z^2}{2}\right)}{z^8}$$

$$\int\left(e^{5x}-2\right)^2dx$$

$$3x^2y^2+9x^2y^2-18xy^2$$

$$2a^2-2a=0$$

$$\frac{d}{dx}\left(10x^2+4xy+3y^2=0\right)$$

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