The Cauchy-Schwarz Inequality says that if v and w are two vectors, then |vows v w . Under what conditions is vow = vw|?Ohm's Law relates current I , voltage V, and impedance Z with the equation I = Z . Z Use Ohm's Law to nd the current given voltage V = 120(cos 60+i sin 60) and impedance Z = 8 (cos 30 + i sin 30) . Powers of i possess an interesting periodic property. i 21' Thus, every natural number power of i can be expressed as one of the numbers: 1' , 1 , z' , or 1. Use this fact and the pattern above to simplify i228