[tex]\displaystyle\bf\\Sin\Big(\frac{\pi }{2} -\alpha \Big)+Cos\Big(\pi +\alpha \Big)=Cos\alpha -Cos\alpha =0[/tex]
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[tex]\displaystyle\bf\\Sin\Big(\frac{\pi }{2} -\alpha \Big)+Cos\Big(\pi +\alpha \Big)=Cos\alpha -Cos\alpha =0[/tex]