Θέμα 1ο 2002 στο 3ο ερώτημα
Ξέρει κανείς γιατί κάνει αλλαγή συστήματος συντεταγμένων? δε θα μπορούσαμε να χρησιμοποιήσουμε τον τύπο ΧΙ.13, εφόσον βλέπουμε ότι τα μέτρα των Εχ Εψ είναι διαφορετικά και έχουν διαφορά φάσης π/4?
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