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sin(x/4)
A inequation with variable

The solution

   /x\     ___   3
sin|-| < \/ x  - -
   \4/           2
sin(x4)<x32\sin{\left(\frac{x}{4} \right)} < \sqrt{x} - \frac{3}{2}
sin(x/4) < sqrt(x) - 3/2
Solving inequality on a graph
02468-8-6-4-2-10105-5