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underset(x to a)"Lt"(1-cos(x-a))/(x-a)^2...

`underset(x to a)"Lt"(1-cos(x-a))/(x-a)^2`

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`underset(x to a)"Lt" (2sin^2((x-a)/2)/(x-a)^2`
= `underset(z to 0)"Lt"(2sin^2z)/(4z^2) = 1/2.(underset(z to 0)"Lt" sinz/z)^2 = 1/2`
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