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Reference angle

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can a reference angle be negative?Tye "reference angle" in google and check out the mathwords site :) no I copied and pasted the
1. 1 answer
2. asked by Kamen
3. 808 views
Use the reference angle to find the exact value of the following expression. Show all your work step by step.cos 135°
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2. asked anonymously
3. 29 views