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intcos^(- 1)(1-2x^2)dx...

`intcos^(- 1)(1-2x^2)dx`

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Given:`intcos^(- 1)(1-2x^2)dx`
`I=intcos^(- 1)(1-2x^2)dx`
Let` x=sin t`
`implies dx=cos tdt`
`I=intcos^(- 1)(1-2x^2)dx`
`I=intcos^(- 1)(1-2sin^2t)costdt`
`I=intcos^(- 1)(1-sin^2t-sin^2t)costdt`
`I=intcos^(- 1)(cos^2t-sin^2t)costdt`
...
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