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Formule goniometriche
addizione, 4
Posto
allora
e
Si ricava sin(x+
a
) = sinx·cos
a
+cosx·sin
a
cos(x+
a
) = cosx·cos
a
-sinx·sin
a
pagina di
Roberto Ricci
L.S. "
A. Righi
", Bologna. Ultima revisione