[n! / pk]  [G* =  ] dt = VARIÁVEIS DE GRACELI.

 [n! / pk]  [G* =  ] dt =

${\displaystyle {\vec {x}}(t)=A(\cos(\omega t+\alpha ){\vec {i}}+\sin(\omega t+\alpha ){\vec {j}})\,}$[n! / pk]  [G* =  ] dt =

${\displaystyle A\cdot \cos(\omega t+\theta )=A\cdot {\frac {e^{i(\omega t+\theta )}+e^{-i(\omega t+\theta )}}{2}},}$    ^[1[n! / pk]  [G* =  ] dt =

${\displaystyle {\begin{aligned}A\cdot \cos(\omega t+\theta )&=\operatorname {Re} \left\{A\cdot e^{i(\omega t+\theta )}\right\}\\&=\operatorname {Re} \left\{Ae^{i\theta }\cdot e^{i\omega t}\right\}.\end{aligned}}}$ [n! / pk]  [G* =  ] dt =