Use De Moivres formula to prove the following double-angle identities a. cos(2x) cos 2 x
Question:
Use De Moivre’s formula to prove the following double-angle identities
a. cos(2x) ≡ cos2 x − sin2 x
b. sin(2x) ≡ 2 sinx cos x
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Using Eq 812 with n 2 we have Expanding t...View the full answer
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Related Book For
Introduction To Actuarial And Financial Mathematical Methods
ISBN: 9780128001561
1st Edition
Authors: Stephen Garrett
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