1. The problem asks: What is $\cos v$?\n\n2. The cosine function, $\cos$, is a trigonometric function that relates an angle in a right triangle to the ratio of the adjacent side over the hypotenuse.\n\n3. The formula for cosine of an angle $v$ is:\n$$\cos v = \frac{\text{adjacent side}}{\text{hypotenuse}}$$\n\n4. Without a specific value or context for $v$, $\cos v$ remains a function of the angle $v$. It can take values between $-1$ and $1$.\n\n5. If you provide a specific angle $v$ (in degrees or radians), I can calculate the exact value of $\cos v$.