[tex]\displaystyle\bf\\Sin(90^\circ-\alpha )-Cos(180^\circ-\alpha )-Ctg(270^\circ +\alpha )=\\\\=Cos\alpha -Cos\alpha +tg\alpha =tg\alpha[/tex]
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[tex]\displaystyle\bf\\Sin(90^\circ-\alpha )-Cos(180^\circ-\alpha )-Ctg(270^\circ +\alpha )=\\\\=Cos\alpha -Cos\alpha +tg\alpha =tg\alpha[/tex]