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CaR

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i had a friend ask me this which I'm not sure about:

Solve:
[ -2sinx.sin(1/2h)]/h

as h approaches to zero.



ThanQ..
 
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Estel

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lim h-->0 -2sinxsin(h/2)/h
= lim h-->0 -2(1/2)sinxsin(h/2)/(h/2)
= -sinx
 
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