Tell Whether or Not the Rational Expressions Are Equivalent $\frac{18 x^{2} y^{4}}{36 x^{3} y^{2}}, \frac{2 y^{2}}{4 x}$

Tell whether or not the rational expressions are equivalent.
- $\frac{18 x^{2} y^{4}}{36 x^{3} y^{2}}, \frac{2 y^{2}}{4 x}$