find the value of cos^1+cos^2+cos^3+....+cos^90????.please answer me with a proper solution
find the value of cos^1+cos^2+cos^3+....+cos^90????.please answer me with a proper solution
kvinayajahnavi , 9 Years ago
Grade 10
10 grade maths> find the value of cos^1+cos^2+cos^3+....+...
1 Answers
Anish Raj
Last Activity: 9 Years ago
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
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