Obtain the condition under which two signals f(t) and f(t)are said to be orthogonal each other.
Two signals $f(t)$ and $g(t)$ are said to be orthogonal if their inner product is zero over a given interval. The inner product of two signals is defined as:
$\langle f(t), g(t) \rangle = \int_{T} f(t) \cdot g(t) \, dt$
For the signals to be orthogonal, the following condition must hold:
$\int_{T} f(t) \cdot g(t) \, dt = 0$