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OpenStudy (anonymous):
Use properties of trigonometric functions to find the exact value of the expression: (sin (-31)/cos (391)) + tan (211)
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OpenStudy (blockcolder):
\[\cos391=\cos31=\cos(-31)\\ \tan211=\tan31\\ \frac{\sin-31}{\cos-31}+\tan31=\tan-31+\tan31=-\tan31+\tan31=0\]
OpenStudy (anonymous):
thank you!
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