1crissy 1crissy
  • 31-03-2014
  • Mathematics
Answered

Which expression is equivalent to cos 150°?
Our three choices are:
A. cos 30°
B. cos 330°
C. cos (-30°)
D. cos (-210°)



Answer :

Аноним Аноним
  • 31-03-2014
[tex]cos150^o=cos(150^o-360^o)=cos(-210^o)[/tex]


[tex]Answer:D[/tex]
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