De Moivre's formula is
Some of the trigonometric identities can be derived using De Moivre's Formula. For double angle formulas, start with the expression
Apply De Moivre's formula, giving Now expand the right side of the equation using the binomial theorem. Since the imaginary parts of both sides of the equations must be equal and the real parts of both sides of the equations must be equal, this gives two identities.# | A | B | C | D |
E | F | G | H | I |
J | K | L | M | N |
O | P | Q | R | S |
T | U | V | W | X |
Y | Z |
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