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The number of real solutions of cos^-1 x...

The number of real solutions of `cos^-1 x + cos^-1 2 x = -pi` is

A

`0`

B

`1`

C

`2`

D

infinitely many

Text Solution

Verified by Experts

The correct Answer is:
A
`-1/2lexle1/2`
`impliescos^(-1)x+cos^(-1)2xepsilon[(pi)/3+0,(2pi)/3+pi]`
`impliescos^(-1)x+cos^(-1)2xepsilon[(pi)/3,(5pi)/3]`
`implies` no solution
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