Bantuin no 5 ini please
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sin²x+3sin x+2 = cos²x
sin²x+3sin x+2 = 1-sin²x
2sin²x+3sin x+1 = 0
misal sin x = p
2p²+3p+1 = 0
2p²+2p+p+1 = 0
2p(p+1)+1(p+1) = 0
(2p+1)(p+1) = 0
p = -½ V p = -1
sin x = -½ V sin x = -1
x = 210°, 330° V x = 270°
x={210°, 270°, 330°}
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