Question

2
cos 24 + cos 55 cos 125+ cos204 + cos 300 = 1/2​

Answer 1

$LHS=cos 24+cos 55+cos 125+cos 204+cos 300=cos 24+cos 55+cos (180-55)+cos (180-24)+cos(270+30)$

$=>cos 24+cos 55- cos 55-cos 24+sin 30=sin 30$

$=>1/2$

$=>RHS$

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