cos 24 degree + cos 55 degree + cos 105 degree + cos 204 degree + cos 300 degree equal to 1.2
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=cos 24+cos 55+cos 125+cos 204+cos 300
= cos 24 +cos 55 +cos (180-55)+cos (180-24)+cos(270+30)
= cos 24 +cos 55-cos 55-cos24+sin30
=sin 30
=1/2
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thanks
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