EQUAÇÕES DE GRACELI [5]

[n! / pk] $[$ $\psi ^{*}$

x(t)=A\cos(\omega t+\alpha )\,

[n! / pk] $[$ $\psi ^{*}$

{\vec x}(t)=A(\cos(\omega t+\alpha ){\vec i}+\sin(\omega t+\alpha ){\vec j})\,

A\cdot \cos(\omega t+\theta )=A\cdot {\frac {e^{{i(\omega t+\theta )}}+e^{{-i(\omega t+\theta )}}}{2}},

[1[n! / pk] $[$ $\psi ^{*}$

{\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}}

\tau ={\frac {2\pi }{\omega }}

[n! / pk] $[$ $\psi ^{*}$

f={\frac {1}{\tau }}={\frac {\omega }{2\pi }}

f={\frac {\omega }{2\pi }}

[n! / pk] $[$ $\psi ^{*}$

x_{2}=A_{2}\sin(\omega t+\phi )