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OpenStudy (anonymous):
cos 90 = 2 cos 45 true or false?
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OpenStudy (anonymous):
False
OpenStudy (anonymous):
can you explain why?
OpenStudy (anonymous):
2 cos(45) = 1.05064398 and cos(90) = -0.448073616 \[1.05064398 \neq -0.448073616\]
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