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Question
Solve `cos^(-1)(sin cos^(-1)x) = pi/2`
Solution
`sin(cos^(-1)x) = cos pi/6`
`sin(cos^(-1)x) = sqrt3/2`
`sin(cos^(-1) x) = sin pi/3`
`cos^(-1) x = pi/3`
`x = cos pi/3`
`x = 1/2`
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