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Kelas 11 MatematikaBab Trigonometri Lanjut
p - q = 30°
sin (p - q) = sin 30°
sin p cos q - cos p sin q = 1/2
sin p cos q - 1/6 = 1/2
sin p cos q = 1/2 + 1/6
sin p cos q = 3/6 + 1/6
sin p cos q = 4/6
sin p cos q = 2/3