[cos^(2)5^(0)+cos^(2)10^(0)+cos^(2)15^(0)+...+cos^(2)360^(0)=],[[" 1) "18," 2) "27," 3) "36," 4) "45]]

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

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

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

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

2(cos^(2) 73^(0) +cos^(2)47^(0)) - cos 154^(0) =

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

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

cos24^(0)+cos5^(0)+cos175^(0)+cos204^(0)+cos300^(@)

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

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