Question

розвязати...............................
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Answer 1

π/3 + 2πk ≤ 3x/4 + π/9 ≤ 2π/3 + 2πk | - π/9

2π/9 + 2πk ≤ 3x/4 ≤ 5π/9 + 2πk |*4/3

8π/27 + 8πk/3 ≤ x ≤ 20π/27 + 8πk/3

Answer 2

● Решение приложено ●