$$\frac{\cot\left(x\right)^2}{\csc\left(x\right)}+\frac{\tan\left(x\right)^2}{\sec\left(x\right)}$$

$$49y^2-121$$

$$\frac{3\left(q^5\right)^4}{5q^4}$$

$$\int_0^l\left(\frac{kz}{\left(z^2+x^2\right)^{\frac{3}{2}}}\right)dx$$

$$3x>=5$$

$$81x^{10}-49y^2z^4$$

$$\frac{64y^{12}-z^6}{2y^2+2}$$