2-4

from math import *
#2

print(min(list(zip(map(lambda x: (10 - 2 * exp(x))/(sin(x) + 1), range(-10, 11)), range(-10, 11))))[1])

#3

with open("text_3_1.txt") as file:
    s = file.readlines()
    print(*list(int(i) for i in s if int(i) % 2 == 1), sep=', ')

#4

with open("test_4_1.txt") as file:
    s = file.readline().split()
    print("Различных слов: ", len(set(s)))
    print(sorted(set(s)))