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If Delta=|{:(sinx,sin(x+h),sin(x+2h)),(s...

If `Delta=|{:(sinx,sin(x+h),sin(x+2h)),(sin(x+2h),sinx,sin(x+h)),(sin(x+h),sin(x+2h),sinx):}|`
find `underset(hto0) lim((Delta)/(h^(2)))`.

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The correct Answer is:
`9 sin cos^2x`
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