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Grade: 11 
        
prove that cos35+cos85+cos155=0.
 
plz sir/madam give me the full solution
 
                                                          Thank you
                                                  
3 months ago

Answers : (1)

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Vikas TU
9517 Points 
							
Dear student 
Cos35 +cos85+cos 155
Cos(60-25)+cos(60+25)+cos155
2 cos60 cos 25 + cos (180-25)
2*1/2 cos25 - cos 25
Cos 25 - cos25=0
3 months ago
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