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OpenStudy (anonymous):
Evaluate cot -220 degrees. round answer to the nearest hundredth
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OpenStudy (anonymous):
Good morning, my child.\[\cot(-220^{\circ}) = \dfrac{\cos(-220^{\circ})}{\sin(-220^{\circ})} \]
hartnn (hartnn):
or since cot has period of 180, \(\cot (-220) = \cot (-220+180)=\cot (-40)\) or even, \(\cot(-40)=\cot(-40+180)=\cot(140)\)
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