January 2019 1 7 Report
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Nyatakan bentuk-bentuk di bawah ini ke dalam bentuk jumlah atau selisih kosinus!
a. 2 cos p cos q
b. 2 cos 3x cos x
c. 2 cos 75° cos 15°
d. Sin 65° sin 25°
e. Cos 10a + cos 2a
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