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Help maths urgent

Help I don’t get how it’s minus one (on the ms)
I got 0 and you can see my working how did I go wrong??IMG_2722.jpegIMG_2723.jpeg
(edited 10 months ago)
Reply 1
Limit of sin(x)/x as x tends to zero is 1. This is hopefully standard knowledge.

In general, the limit of 0/blah = 0, except when that blah is 0 itself, then it could be... uh... anything really.

Oh and another method, the expression there is precisely the definition of a derivative.
(edited 10 months ago)

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