October 2018 1 87 Report
Cos(x+30) = 1/2 , x= ? , Kalo hafal trigon cos 60 = 1/2 jadi bisa langsung x = 30 , tapi gimana ngerjakan soal serupa seperti itu menggunakan cara cosxcos30 - sinxsin30 = 1/2 ? tolong beri jalan ya kak :D

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