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Question
`2 "cos"^-1 "x = sin"^-1 (2"x" sqrt(1 - "x"^2))` is true for ____________.
Options
all x
x > 0
`"x" in [-1, 1]`
`1/sqrt2 le "x" le 1`
MCQ
Fill in the Blanks
Solution
`2 "cos"^-1 "x = sin"^-1 (2"x" sqrt(1 - "x"^2))` is true for `underline(1/sqrt2 le "x" le 1)`.
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