Question:
Let $t$ be the smallest positive real number for which $\cos t = \cos t^\circ.$  (We are taking the cosine of $t$ radians on the left and of $t$ degrees on the right.)  Determine $\lfloor t \rfloor.$

Answer:
We have that
\[\cos t = \cos \left( \frac{180t}{\pi} \right)^\circ.\]If the cosines of two angles (in degrees) are equal, either their difference is a multiple of $360^\circ,$ or their sum is a multiple of $360^\circ.$  Thus, $t + \frac{180t}{\pi} = 360^\circ k$ for $t - \frac{180t}{\pi} = 360^\circ k.$

From the first equation,
\[t = \frac{360^\circ \pi k}{\pi + 180}.\]The smallest positive real number of this form is $\frac{360 \pi}{\pi + 180}.$

From the second equation,
\[t = \frac{360^\circ \pi k}{\pi - 180}.\]The smallest positive real number of this form is $\frac{360 \pi}{180 - \pi}.$

Therefore, $t = \frac{360 \pi}{\pi + 180} \approx 6.175,$ so $\lfloor t \rfloor = \boxed{6}.$