50 решить неравенство! sin (п/5-4x) > -1/2

Решение sin (п/5-4x) > -1/2sin(4x -  π/5) < 1/2 -  π  - arcsin(1/2) + 2πn < 4x -  π/5 < arcsin(1/2) + 2πn, n∈z -  π -  π/6 + 2πn  < 4x -  π/5 <   π/6 + 2πn, n∈z   - 7π/6 + 2πn  < 4x -  π/5 <   π/6 + 2πn, n∈z   - 7π/6 +  π/5 +  2πn  < 4x   <   π/6 +  π/5  + 2πn, n∈z   - 29π/30 + 2πn < 4x < 11π/30 + 2πn, n∈z   - 29π/120 + πn/2  <   x < 11π/120 +   πn/2, n∈z