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Grade: 10

                        

find the value of cos^1+cos^2+cos^3+....+cos^90????.please answer me with a proper solution

4 years ago

Answers : (1)

Anish Raj
29 Points
							
cos^2 1 + cos^89= 1 (cos 89= sin1 )
similarly upto cos^44 + cos^2 46 = 1 ( coss 44= sin 46)
i.e; (cos^2 1 + ...cos ^ 90)= 44 + cos^2 45 + cos ^2 90= 44.5
4 years ago
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