1.

The number of real solutions of `cos^-1 x + cos^-1 2 x = -pi` isA. `0`B. `1`C. `2`D. infinitely many

Answer» Correct Answer - 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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