Question
Answer
$$cos(a+bi)=bcios+acos$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}cos(a+bi)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}acos+bcios \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}bcios+acos\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{cos} $ by $ \left( a+bi\right) $ $$ \color{blue}{cos} \cdot \left( a+bi\right) = acos+bcios $$ |
| ② | Combine like terms: $$ bcios+acos = bcios+acos $$ |
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