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Find the value of 2\ sec^(-1)2+sin^(-1)(...

Find the value of `2\ sec^(-1)2+sin^(-1)(1/2)` .

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`2\ sec^(-1)2+sin^(-1)(1/2)`
`=2 cos^(-1)(1/2)+sin^(-1)(1/2)`
`=cos^(-1)1/2+cos^(-1)1/2+sin6(-1)1/2`
`=cos^(-1) 1/2+pi/2`
`pi/3+pi/2=>frac{5pi}{6}`
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