$$25-10y+y^2$$

$$14.\:\frac{25}{7}+24.\frac{25}{24}$$

$$\frac{2}{5}u^3-\frac{1}{2}v\:.\:\frac{2}{5}u^3+\frac{1}{2}v$$

$$3\sqrt{5n}$$

$$\frac{d^2}{dx^2}\sqrt[3]{\tan\left(3x\right)}$$

$$30x^2y-15x^2y+45xy$$

$$\left(\frac{3y}{\sqrt{x}}\right)^4$$