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Find area bounded between y = cos^(-1)x ...

Find area bounded between `y = cos^(-1)x` and y-axis between `y = pi/2` and `y = pi`.

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` y = cos^(-1) rArr x = cos y`
Required area `= underset(pi/2)overset(pi)intcosydy`

`= - sin]_(pi/2)^(pi) = 1`
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