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For the equation $\cos^{- 1} x + \cos^{- 1} 2 x + π = 0$ , the number of real solutions is

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Correct option is C

we have cos−1x+cos−1(2x)=−π, which is not possible as cos−1xand cos−12x never take negative values.∵cos-1x,cos-12x∈0,π

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For the equation cos−1x+cos−12x+π=0, the number of real solutions is

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For the equation $\cos^{- 1} x + \cos^{- 1} 2 x + π = 0$ , the number of real solutions is