If $\sin^2 \theta + \sin \theta = 1,$ then find $\cos^4 \theta + \cos^2 \theta.$
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If $\sin^2 \theta + \sin \theta = 1,$ then find $\cos^4 \theta + \cos^2 \theta.$
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
1
If $\sin^2 \theta + \sin \theta = 1,$ then find $\cos^4 \theta + \cos^2 \theta.$
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