9. diketahui sin 3o = p. nilai
dari sin 276o = ….
Jawab:
Sin
276o = sin(270o + 6o)
=
sin 270o cos 6o + cos 270o sin 6o
=
-1 cos 6o + 0 . sin 6o
=
-1 cos 2 (3)
=
-1 (1 – 2p2)
=
-1 + 2p2
= 2p2 – 1
9. diketahui p dan q adalah sudut lancip dan p - q = 30o .jika cos p sin q =
, maka nilai
dari sin p cos q =…..
jawab :…..
sin
(p-q) = cos p sin q – sin p cos q
sin
30o =
– sin p cos q
sin p cos q =
sin p cos q = - 
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