
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
In the Cartesian coordinate system $xOy$, the parametric equations of curve $C_{1}$ are $\left\{{\begin{array}{l}{x=1+t\cos\alpha}\\{y=t\sin\alpha}\end{array}}\right.$ ($t$ is the parameter, $0\leqslant \alpha\ \ \lt \pi$). Taking the origin $O$ as the pole and the non-negative $x$-axis as the polar axis, the polar equation of curve $C_{2}$ is ${\rho^2}=\frac{{12}}{{3+{{\sin}^2}\theta}}$. <br/>$(1)$ Find the general equation of curve $C_{1}$ and the Cartesian equation of $C_{2}$; <br/>$(2)$ Given $F(1,0)$, the intersection points $A$ and $B$ of curve $C_{1}$ and $C_{2}$ satisfy $|BF|=2|AF|$ (point $A$ is in the first quadrant), find the value of $\cos \alpha$.

Present the answer in LaTex format: \boxed{Your answer}
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