What is the range of the function $y=\log_2 (\sqrt{\cos x})$ for $-90^\circ< x < 90^\circ$?
Question:
What is the range of the function $y=\log_2 (\sqrt{\cos x})$ for $-90^\circ< x < 90^\circ$?
Answer:
Let's think step by step.

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(-\infty,0]
What is the range of the function $y=\log_2 (\sqrt{\cos x})$ for $-90^\circ< x < 90^\circ$?
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