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Mathematics › Functions

Trigonometric functionsHigh frequency

10-question practice

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Question 1 of 6
If sin⁡2x+2asin⁡xcos⁡x+3cos⁡2x≥0\sin^2x+2a\sin x\cos x+3\cos^2x\ge0 holds for every real number xx, the set of possible real values of aa is ( ).
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