推 suhorng :2. exp(i ×3θ) = [exp(iθ)]^3, 實部=實部, 虛部 09/28 19:59
→ suhorng : = 虛部左右比對 09/28 19:59
1.Let |z|=3 and |e^z/(z^2+1)|≦L determine the value of L
2.Express (1)cos3θ and (2)sin3θ in term of cosθ and sinθ by using Euler's
formula.
3.Let |z|=2 |Re(2 + zbar + z^3|<L_1 and |1/(z^4-4z^2+3)|<L_2 then
determine the value of L_1 and L_2
就這幾題
我不知道看到要怎麼下手@@
拜託了QQ
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