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x->0
cosx =1-(1/2)x^2+o(x^2)
xcosx =x-(1/2)x^3+o(x^3)
sinx = x-(1/6)x^3 +o(x^3)
xcosx -sinx = -(1/3)x^3+o(x^3)
lim(x->0) (xcosx - sinx)/(2x^2.sinx)
=lim(x->0) (xcosx - sinx)/(2x^3)
=lim(x->0) -(1/3)x^3/(2x^3)
=-1/6
cosx =1-(1/2)x^2+o(x^2)
xcosx =x-(1/2)x^3+o(x^3)
sinx = x-(1/6)x^3 +o(x^3)
xcosx -sinx = -(1/3)x^3+o(x^3)
lim(x->0) (xcosx - sinx)/(2x^2.sinx)
=lim(x->0) (xcosx - sinx)/(2x^3)
=lim(x->0) -(1/3)x^3/(2x^3)
=-1/6
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