数学归纳法证(Cosa+iSina)n次方=Cosna+Sinnan属于N*

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数学归纳法证(Cosa+iSina)n次方=Cosna+Sinnan属于N*
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数学归纳法证(Cosa+iSina)n次方=Cosna+Sinnan属于N*
数学归纳法证(Cosa+iSina)n次方=Cosna+Sinnan属于N*

数学归纳法证(Cosa+iSina)n次方=Cosna+Sinnan属于N*
很高兴回答你的问题.

n=1
LS = cosa+isina=RS
p(1) is true
Assume p(k) is true
ie
(cosa+isina)^k = cos(ka)+isin(ka)
for n=k+1
LS
= (cosa+isina)^(k+1)
=[cos(ka)+isin(ka)](cosa + isina)

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n=1
LS = cosa+isina=RS
p(1) is true
Assume p(k) is true
ie
(cosa+isina)^k = cos(ka)+isin(ka)
for n=k+1
LS
= (cosa+isina)^(k+1)
=[cos(ka)+isin(ka)](cosa + isina)
= (cos(ka)cosa-sin(ka)sina) + i(sin(ka)cosa+cos(ka)sina)
=cos(k+1)a + isin(k+1)a
=RS
p(k+1) is true
By principle of MI, it is true for all n

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