[tex]\displaystyle\bf\\15)\\\\tg\Big(90^\circ+\alpha \Big)=-Ctg\alpha \\\\16)\\\\tg\Big(\pi -\alpha \Big)=-tg\alpha \\\\17)\\\\tg\Big(\pi +\alpha \Big)=tg\alpha \\\\18)\\\\tg\Big(\frac{3\pi }{2} -\alpha \Big)=Ctg\alpha \\\\19)\\\\tg\Big(\frac{3\pi }{2} +\alpha \Big)=-Ctg\alpha \\\\20)\\\\tg\Big(2\pi -\alpha \Big)=-tg\alpha\\\\21)\\\\tg\Big(2\pi +\alpha \Big)=tg\alpha[/tex]
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[tex]\displaystyle\bf\\15)\\\\tg\Big(90^\circ+\alpha \Big)=-Ctg\alpha \\\\16)\\\\tg\Big(\pi -\alpha \Big)=-tg\alpha \\\\17)\\\\tg\Big(\pi +\alpha \Big)=tg\alpha \\\\18)\\\\tg\Big(\frac{3\pi }{2} -\alpha \Big)=Ctg\alpha \\\\19)\\\\tg\Big(\frac{3\pi }{2} +\alpha \Big)=-Ctg\alpha \\\\20)\\\\tg\Big(2\pi -\alpha \Big)=-tg\alpha\\\\21)\\\\tg\Big(2\pi +\alpha \Big)=tg\alpha[/tex]