3.1 X(eo)=2xnJe-jon where x[n] is a real sequence. Therefore X(e)=Rl∑xnlo/。 ∑xR(-mu)=∑ x[n]cos(on),and xmm)=m∑刈nm∑刈mc-m)=-2 xn] sin(oon) Since cos(on)and sin(on)are, respectively, even and odd functions of o, Xre(eJo) is an even function of o
Through the study of these two periods of class, the students should understand the text correctly. The new words should be read fluently. The new words and the expressions in the text should be learnt by heart
People from different cultures have d ifferent ideas about the food. We may have our food likes and dislikes because of nutritious and religious reasons. However, far beyond these; they are also a result of the ways of life of d ifferent people. For example
What is Convective Heat Transfer? You have already experienced it. Difficulty lies in generalizing our experience; filtering it down to a few laws: learning how to apply these laws to systems we engineers design and use Here is what i want you to do:
