$f(x)=2\sin\left(2x\right)$f(x)=2\sin\left(2x\right)

$f(x)=2\pi \cdot \sin\left(2x\right)$f(x)=2\pi \cdot \sin\left(2x\right)

$\displaystyle f(x)=2\sin\left( \frac{x}{2} \right)$\displaystyle f(x)=2\sin\left( \frac{x}{2} \right)

$\displaystyle f(x)=2\pi \cdot \sin\left( \frac{x}{2} \right)$\displaystyle f(x)=2\pi \cdot \sin\left( \frac{x}{2} \right)