- #1
omlatte1
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Homework Statement
Determine limA→∞(sinc(x/2A))
Homework Equations
I would use L'Hôpital's rule, but I'm not sure if it is valid in this case as the function is that of x, not A. I want to know if it's valid to treat x as constant and take derivatives with respect to A and evaluate as A->inf.
The Attempt at a Solution
limA→∞(sinc(x/2A))=limA→∞(sin(x/2A)/(x/2A))
=limA→0(sin((x/2)A)/((x/2)A))
=limA→0(cos((x/2)A))
=1
Is this correct usage of L'Hôpital's rule?