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If tan x=−1, and 90° < x < 180°, what is cos⁡(x−30°)?
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If tan x=−1, and 90° < x < 180°, what is cos⁡(x−30°)?

User Hesham Yassin
by
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1 Answer

3 votes

Answer:

√2/2

Explanation:

User Lunikon
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