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anonymous
 5 years ago
use de moivre's formula with n= 2 to find trigonometric identities cos2theta and sin 2theta
plz help me.....:(
anonymous
 5 years ago
use de moivre's formula with n= 2 to find trigonometric identities cos2theta and sin 2theta plz help me.....:(

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0\[(\cos(\theta) + isin(\theta))^n = cos(n \theta) +isin(n \theta ) ) \]

watchmath
 5 years ago
Best ResponseYou've already chosen the best response.1\(\cos (2\theta)_1\sin(2\theta)=(\cos \theta +i \sin \theta)^2=(\cos^2\thetasin^2\theta)+i(2\sin\theta\cos\theta)\)

watchmath
 5 years ago
Best ResponseYou've already chosen the best response.1The left most expression should be \(\cos(2\theta)+i\sin(2\theta)\)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0there is actually something to do here yes? besides using laws of exponents i mean.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0oops my apologies whatchmath wrote it. should should also mumble something about setting real part = real part and imaginary part = imaginary part.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0watchmath i mean. yikes it is early

watchmath
 5 years ago
Best ResponseYou've already chosen the best response.1Are you in US too satellite?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0trying to learn latex and practicing here as much as i can
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