Fourier transform of t.e-at u(t), (where, a > 0, u(t) is the Unit step function) is:
1
\(\frac{a}{{{\left( a~+~j2\pi f \right)}^{2}}}\)
2
\(\frac{1}{{{\left( a~+~j2\pi f \right)}^{2}}}\)
3
\(\frac{a}{a~+~j2\pi {{f}^{~}}}\)
4
\(\frac{1}{a~+~j2\pi {{f}^{~}}}\)