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(9pi)/(8)-(9)/(4)sin^(-1)""(1)/(3)=(9)/(...

`(9pi)/(8)-(9)/(4)sin^(-1)""(1)/(3)=(9)/(4)sin^(-1)""(2sqrt(2))/(3)`
`(9pi)/(8)-(9)/(4)sin^(-1)""(1)/(3)`
`=(9)/(4)((pi)/(2)-sin^(-1)""(1)/(3))=(9)/(4)cos^(-1)""(1)/(3)`
`=(9)/(4)sin^(-1)""sqrt(q-((1)/(3))^(2)) " " ( :. cos^(-1)x=sin^(-1)sqrt(1-x^(2)))`
`=(9)/(4)sin^(-1)sqrt((8)/(9))=(9)/(4)sin^(-1)""((2sqrt(2))/(3))`=RHS Hence Proved.

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