Φ Φ= == COS COSX A A(0) (0)= + Ω ΦCOS(

1- Cơ sở lý thuyết: ϕ ϕ= == cos cosx A a

(0)

(0)

= + ω ϕcos( . )x A  x A t

=

0

→ ⇔

t

  v A t v A v A bω ω ϕ ω ϕ ϕsin( . ) sin sin= − + = − − = =  ω





a

x

Vậy

⁰

^{( 0 )}

=

+

←

→

=

+



cos(

)

^t

,

x

A

t

x

a

bi

v

( 0 )



= −

b

