When x tends to 90 degrees, find the limit of [(SiNx) ^ 3-2 (SiNx) ^ 2 + 1] / [sinx-1]

LIM (X -- > 90 °) [(SiNx) ^ 3-2 (SiNx) ^ 2 + 1] / [sinx-1] (type 0 / 0, using lobita rule)
=lim(x-->90°)[3cosx(sinx)^2-4cosx*sinx]/cosx
=lim(x-->90°)[3(sinx)^2-4sinx]
=3-4=-1

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