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I believe it is C but can someone please explain it to me

 
RainbowPanda  Apr 16, 2018
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You are correct....!!!!

 

 35°  is a first quadrant angle....and all the trig functions are positive in the first quadrant

 

But  145°  is a second quadrant angle....and the cosine is negative in this quadrant

 

 

cool cool cool

 
CPhill  Apr 16, 2018

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