`cos^2(5^0)+cos^2(10^0)+cos^2(15^0)+.........+ cos^2(360^0)`=

cos1^(0)cos2^(0)...cos179^(@)

cos^(2)5^(@)+cos^(2)10^(@)+cos^(2)15^(@)+.....+cos^(2) 90^(@)=

cos^(2) 5^(@) + cos^(2) 10^(@) +cos^(2) 15^(@)+...+cos^(2)360^(@)=

cos^(2)5^(@)+cos^(2)10^(@)+cos^(2)15^(@)+..+cos^(2)355^(@)

cos^(2)75^(0)+cos^(2)15^(0)-cos75^(0)cos15^(0)=

cos^(2)5^(@) +cos^(2)10^(@) + cos^(2) 15^(@) +…..+cos^(2) 85^(@) + cos^(2) 90^(@) is equal to

cos^2 0^@+cos^2 60^@ =

19. cos^2 5 + cos^2 10+ cos^215 + ... + cos^2 360º =1) 18 2)27 3)364345

Value of (1-(cos61^0)/(cos1^0))*(1-(cos62^0)/(cos2^0))*(1-(cos63^0)/(cos3^0)) .......... *(1-(cos119^0)/(cos59^0)) (a) -1 (b) 1 (c) 2 (d) -2

cos1^(0)+cos2^(0)+cos3^(0)+ . . .+cos180^(0) =