$$\frac{9^2}{4}-ab+b^2$$

$$\left(-x^5y^2z^3\right)^5$$

$$f\left(x\right)=\left|x\right|-\left|x\right|$$

$$\frac{dy}{dx}+\sin\left(x\right)x=-\sin\left(x\right)$$

$$\int\frac{1}{\left(x^2\sqrt{289-x^2}\right)}dx$$

$$\frac{\cot\left(x\right)^2}{1+\csc\left(x\right)}+1$$

$$\int6\:e^{14k}dk$$