Determine the limit of the trigonometric function (if it exists).

1. lim sin x / 5x
(x -> 0)
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2. lim tan^2x / x
(x ->0)

3. lim cos x tan x / x
(x -> 0)



Below, find lim f(x+h) - f(x) / h
----------- (x->0)

1. f(x) = radical x



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