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The equation sin^4x-2cos^2x+a^2=0 can be...

The equation `sin^4x-2cos^2x+a^2=0` can be solved if (a) `-sqrt(3)lt=alt=sqrt(3)` (b) `sqrt(2)lt=alt=""sqrt(2)` (c) `-""1lt=alt=a` (d) none of these

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