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1-2sin4x
A inequation with variable

The solution

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1 - 2*sin(4*x) < \/ cos(x) *4*x
$$1 - 2 \sin{\left(4 x \right)} < 4 x \sqrt{\cos{\left(x \right)}}$$
1 - 2*sin(4*x) < (4*x)*sqrt(cos(x))
Solving inequality on a graph