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Mathematics
Trigonometry
De Moivre's Theorem
How to simplify the expression using De Moivre's theorem? The question is cos 2x + i sin 2x / cos 3x + i sin 3x.
1 answer
cis2x = (cis x)^2
cis3x = (cis x)^3
so, the quotient is 1/cis x
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