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OpenStudy (anonymous):
Ill give a medal and fan anyone who can show me how to do this and give me the correct answer.!! Verify: cos(180° + x) = -cos x. Please! I tried to type this in google to learn how to do it and it litterly said no results. so i dont even know where to start:/
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OpenStudy (ddcamp):
Maybe a glance at the unit circle could help: |dw:1384921096938:dw|
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