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OpenStudy (anonymous):
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OpenStudy (kc_kennylau):
Did you learn the cosine rule?
OpenStudy (kc_kennylau):
Yes or no?
OpenStudy (kc_kennylau):
Never mind if no, if a^2+b^2>c^2, theta is acute; if a^2+b^2<c^2, theta is obtuse
OpenStudy (kc_kennylau):
Don't doubt yourself!
OpenStudy (kc_kennylau):
cos theta > 0 because theta is acute
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OpenStudy (anonymous):
okay?
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