enter image description here In my book solution is given like this. But i am solving like this , am i doing wrong?? enter image description here


Yes, you're doing it wrong. :) Inverse systems in time domain satisfy

$$h[n] * h_i[n] = \delta[n]$$

where $*$ denotes convolution and $h_i[n]$ is the impulse response of the inverse system. If you DTFT this equation, you'll get a).

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