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If $4 \sin^{- 1} x + \cos^{- 1} x = π$ then $x$ equal

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Correct option is A

We have,4sin−1⁡x+cos−1⁡x=π⇒4sin−1⁡x+π2−sin−1⁡x=π⇒3sin−1⁡x=π2⇒x=sin⁡π6=12

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If 4sin−1⁡x+cos−1⁡x=π then x equal

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If $4 \sin^{- 1} x + \cos^{- 1} x = π$ then $x$ equal