2sin kuadrat x +5 sin x-3=0 dan -r/2

2sin²x - 5sin x - 3 = 0
Misal sin x = a, maka:
2a² - 5a - 3 = 0
(2a+1) (a-3) = 0
* 2a+1 = 0
2a = -1
a = -1/2
sin x = -1/2
x = 210, 330
* a-3 = 0
a = 3
sin x = 3 (tidak memenuhi)
Jadi, HP={210,330}

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