Question

第十二题咋么做

• 你的回答被采纳后将获得：
• 系统奖励15（财富值+成长值）+难题奖励20（财富值+成长值）

Answer 1

a(n+1)=a(n)*2cos(2^(n-1)α)
a(2)=sinα*2cosα=sin(2α)
a(3)=sin(2α)2cos(2α)=sin(4α)
a(4)=sin(8α)
a(5)=sin(16α)
...
a(n)=sin(2^(n-1)α)

Answer 2

a2 = sinα 2 cosα = sin2α
a3 = sin2α 2 cos2α = sin4α
a4 = sin4α 2 cos4α = sin8α
a5 = sin8α 2 cos8α = sin16α
a(n) = sin(2^(n-1)α)