Question
Answer
$$(2cosp\dfrac{i}{4}+2isinp\dfrac{i}{4})^{12}=(2cosp\dfrac{i}{4}+2i^2nsp\dfrac{i}{4})^{12}$$
Explanation
| $$ \begin{aligned}(2cosp\frac{i}{4}+2isinp\frac{i}{4})^{12}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}(2cosp\frac{i}{4}+2i^2nsp\frac{i}{4})^{12}\end{aligned} $$ | |
| ① | $$ 2 i s i n = 2 i^{1 + 1} n s = 2 i^2 n s $$ |
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