cos^(2)1^(0)+cos^(2)2^(0)+cos^(2)3^(0).....+cos^(2)90^(@)=

cos^(2)1^(@)+ cos^(2)2^(@)+cos^(2)3^(@)+....+cos^(2)90^(@)=

Find the value of cos^(2)1^(@)+cos^(2)2^(@)+cos^(2)3^(@)+ -----+cos^(2)87^(@)+cos^(2)88^(@)+cos^(2)89^(@)+cos^(2)90^(@)

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

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

(cos^(2)1^(0)-cos^(2)2^(0))/(2sin3^(0)*sin1^(0)) is equal to

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

Write 'true' or 'false': The value of cos 0^(@) xx cos 1^(@) xx cos2^(@) xx cos3^(@) xx ….. xx cos90^(@) is 1.

The value of (cos^(2)33^(0)-cos^(2)57^(0))/(sin21^(0)-cos21^(0)) is