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Grade: 11 

                        
Cos1+cos2+cos3+......+cos180=?Plz give me the answer
3 years ago

Answers : (1)

Swati
12 Points 
							=Cos1+cos2+cos3+.....+cos90+cos (180_89)+cos (180_88)+....+cos (180_1)+cos180=cos1+cos2+....+cos90_cos89_cos88_..........cos1+cos180=cos90+cos180=0_1=_1
3 years ago
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