Find the exact value of the trigonometric expression without the use of a calculator.If sin ? = - 
, 
< ? < 2? and tan ? = - 
, 
< ? < ?, find the exact value of cos (? + ?).
A. 
B. - 
C. - 
D. - 
Answer: B
Mathematics
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A. 
B. 
C. 
D. 
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?
?
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