Brief explanation about Fourier Transform
for the CT Fourier Transform, there are two important formulas that we have to know which are,
$ x(t) = \frac{1}{2\pi} \int_{-\infty}^{\infty}X(\omega)e^{j\omega t} d\omega $
and
$ X(\omega) = \int_{-\infty}^{\infty}x(t)e^{-j\omega t}dt $
Above equations are referred to as the Fourier transform pair.
$ X(\omega) $ stands for Fourier Transform and the first equation is inverse Fourier transform equation.