For the equation \[{{\cos }^{-1}}x+{{\cos }^{-1}}2x+\pi =0\], the number of real solution is [Orissa JEE 2005]

For the equation \[{{\cos }^{-1}}x+{{\cos }^{-1}}2x+\pi =0\], the numb

1.	For the equation \[{{\cos }^{-1}}x+{{\cos }^{-1}}2x+\pi =0\], the number of real solution is [Orissa JEE 2005]
A.	1
B.	2
C.	0
D.	\[\infty \]
Answer» D. \[\infty \]

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For the equation \[{{\cos }^{-1}}x+{{\cos }^{-1}}2x+\pi =0\], the number of real solution is [Orissa JEE 2005]

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