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(5)
lim(x->1) sin(1-x)/(x^2-1)
=lim(x->1) (1-x)/(x^2-1)
=lim(x->1) (1-x)/[(x-1)(x+1)]
=lim(x->1) -1/(x+1)
=-1/2
(7)
lim(x->0) x(x+3)/sinx
=lim(x->0) x(x+3)/x
=lim(x->0) (x+3)
=3
lim(x->1) sin(1-x)/(x^2-1)
=lim(x->1) (1-x)/(x^2-1)
=lim(x->1) (1-x)/[(x-1)(x+1)]
=lim(x->1) -1/(x+1)
=-1/2
(7)
lim(x->0) x(x+3)/sinx
=lim(x->0) x(x+3)/x
=lim(x->0) (x+3)
=3
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