solve the problem fast
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cos24+cos55+cos125+cos204+cos300
cos24 +cos55+ cos(180_55)+ cos (180-24)+cos(270+30)
cos24+cos55-cos55-cos24+sin30
sin30
1/2
cos24 +cos55+ cos(180_55)+ cos (180-24)+cos(270+30)
cos24+cos55-cos55-cos24+sin30
sin30
1/2
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