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Determine the range of values of 0 in [...

Determine the range of values of ` 0 in [ 0,2 pi] ` for which `(cos theta ,sin theta )` lies inside the triangle formed by the lines `x+y-2=0, x - y - 1 = 0 and 6x + 2y - sqrt(10) = 0 `

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The correct Answer is:
`theta in (0,(5pi)/6-tan^(-1)3)`
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