$$x^2-\:\:\frac{y^2}{4}$$

$$\csc^42x\:-\:4=\:0$$

$$4x^6+11x^2-9x^6+5x^6+17x^2-12x^6$$

$$\int_{\frac{y}{2}}^3\left(x\sin\left(y\right)\right)dy$$

$$\lim_{x\to0}\left(e^{7x}-8x\right)^{\left(\frac{1}{2x}\right)}$$

$$\lim_{x\to0}\left(\frac{x^2+498x}{6sinx}\right)$$

$$27x^3m+3xy-9x^2yb$$