Question 1197376
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In any triangle, the smallest angle is opposite the shortest side.  So the smallest angle in this problem is opposite the side of length 3.<br>
Since the side opposite the smallest angle is the leg of length 3, the side adjacent to the the smallest angle is the leg of length 4.<br>
For a right triangle, cos(theta) = adjacent side length / hypotenuse length.<br>
So the cosine of the smallest angle in this triangle is 4/5.<br>
ANSWER: 4/5<br>
Note there is no point in including the instruction "Please draw/show the triangle" in your post; clearly that part of the problem is for you to do.<br>