engineering recuitment HPCL Junior Executive 2025 Mock Test Signals and Systems Introduction To Signals and Systems Standard Signals
Which one of the following relations is not correct?
1
f(t) δ(t) = f(0) δ(t)
2
\(\displaystyle\int_{-\infty}^\infty f(t) \ \delta(\tau) \ d\tau =1\)
3
\(\displaystyle\int_{-\infty}^\infty \delta(\tau) \ d(\tau) =1\)
4
f(t) δ(t - τ) = f(τ) δ(t - τ)