[tex]\displaystyle\bf\\1)\\\\Cos\Big(\frac{\pi }{2} +\alpha \Big)=-Sin\alpha \\\\\\2)\\\\Cos\Big(180^\circ-\alpha \Big)=-Cos\alpha[/tex]
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[tex]\displaystyle\bf\\1)\\\\Cos\Big(\frac{\pi }{2} +\alpha \Big)=-Sin\alpha \\\\\\2)\\\\Cos\Big(180^\circ-\alpha \Big)=-Cos\alpha[/tex]