3. [6pts] $\frac{1}{2 \pi) \int_{\omega_{1}}^{\omega_{2}} e^{j omega n} d \omega+\frac{1}{2 \pi} \int_{-\omega_{2}}^{-Womega_{1}} ej omega n} d \omega=$ ? (Note: You need to simplify your answer to receive full credit) CS.SD.065