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

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

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Isabella 2 weeks 2021-09-04T01:23:46+00:00 1 Answer 0 views 0

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    2021-09-04T01:25:18+00:00

    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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