lim_x->0 (e^(2x) - e^(-3x))/x * lim_x->0 sin(2x)/x =
= lim_x->0 [ 2e^(2x) - (-3) e^(-3x) ]/1 * lim_x->0 2* sin(2x)/(2x) =
= (2*1 + 3*1) * 2 lim_y->0 sin(y)/y =
= 5*2*1 = 10
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