$\omega=2\pi$
Dao động 1: $A_1=8(cm); \varphi_1=\dfrac{\pi}{3}$
Dao động 2: $A_2=6(cm); \varphi_2=0$
Dao động tổng hợp:
$A=\sqrt{A_1^2+A_2^2+2A_1.A_2\cos(\varphi_1-\varphi_2)}=2\sqrt{37}$
$\tan\varphi=\dfrac{A_1\sin\varphi_1+A_2\sin\varphi_2}{A_1\cos\varphi_1+A_2\cos\varphi_2}=\dfrac{4}{\sqrt3}$
$\to x=2\sqrt{37}\cos(2\pi t+\arctan\dfrac{4}{\sqrt3})$