Here is the proof using LaTeX:

Let $x$ and $y$ be two random integers. The product $xy$ is even if and only if both $x$ and $y$ are even or both $x$ and $y$ are odd.

The probability that $x$ is even is $\frac{1}{2}$ and the probability that $x$ is odd is also $\frac{1}{2}$. By the same reasoning, the probability that $y$ is even is $\frac{1}{2}$ and the probability that $y$ is odd is $\frac{1}{2}$.

Therefore, the probability that both $x$ and $y$ are even or both $x$ and $y$ are odd is given by:

$\frac{1}{2} \cdot \frac{1}{2} + \frac{1}{2} \cdot \frac{1}{2} = \frac{1}{2} + \frac{1}{2} = 1$

Thus, the probability that $xy$ is even is $\frac{3}{4}$.
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