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I'm an electronics engineer and I'm trying to solve this two equations:

1.

sin(ax)/a, when a=0

I do it this way:

Multiply by x and make a limit transition

lim sin(ax)x/ax, as lim sin(ax)/ax = 1

ax->0 ax->0

I infer:

lim sin(ax)x/ax = x

ax->0

2.

Unfortunatelly I'm nowhere with

cos(ax)/a, when a=0

Any help :)

P.S.

Sorry for the bad english.