The equation \( \sin ^{4} x-2 \cos ^{2} x+a^{2}=0 \) is solvable if....

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The equation \( \sin ^{4} x-2 \cos ^{2} x+a^{2}=0 \) is solvable if
(1) \( \sqrt{3} \geq a \geq-\sqrt{3} \)
\( \mathrm{P} \)
(2) \( \sqrt{2} \geq a \geq-\sqrt{2} \)
W
(3) \( 1 \geq a \geq-1 \)
(4) None of these


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