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Question 1
The equation $\sin^4 x + \cos^4 x + \sin 2x + \alpha = 0$ is solvable for:
A.
$-\dfrac{1}{2} \le \alpha \le \dfrac{1}{2}$
B.
$-3 \le \alpha \le 1$
C.
$-\dfrac{3}{2} \le \alpha \le \dfrac{1}{2}$
D.
$-1 \le \alpha \le 1$
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