https://www.desmos.com/calculator/yoq5tfkhsa

`f\left(x\right)=x^{\frac{2}{3}}+0.9\left(3.3-x^2\right)^{\frac{1}{2}}\cdot\sin\left(a\cdot\pi\cdot x\right)`

https://www.desmos.com/calculator/yoq5tfkhsa

`f\left(x\right)=x^{\frac{2}{3}}+0.9\left(3.3-x^2\right)^{\frac{1}{2}}\cdot\sin\left(a\cdot\pi\cdot x\right)`