$$x\:+\:2y\:-\:4^2$$

$$\int11x\sin\left(3x\right)dx$$

$$\frac{dy}{dx}=1+3y\tan\left(x\right)$$

$$2\sin^2\left(t\right)=-4\cos\left(t\right)$$

$$\left(x-18\right)\left(x+13\right)$$

$$2^3-\left(-1\right)^4$$

$$4a^2b-5ab^2+a^2b-ab^2$$