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Hi, pls help me solve both of the two items here. Really need it. Thank you so much. 1. Show that e-ie = cos 0

Hi, pls help me solve both of the two items here. Really need it. Thank you so much.

1. Show that e-ie = cos 0 - i sin 0. 2. Show that cos 0 = =(e +e ) and sind = 7 (el - e-10)

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