[tex]sin^{2}\alpha +cos^{2}\alpha =1\\ \\ sin^{2}\alpha +(-\frac{3}{5})^{2}=1\\ \\ sin^{2}\alpha+\frac{9}{25}=1\\ \\ sin^{2}\alpha =\frac{16}{25}\\ \\ sin\alpha =\frac{4}{5}\\ \\ tg\alpha =\frac{sin\alpha }{cos\alpha } =\frac{\frac{4}{5} }{-\frac{3}{5} }=\frac{4}{5}*(-\frac{5}{3})=-\frac{4}{3}[/tex]
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[tex]sin^{2}\alpha +cos^{2}\alpha =1\\ \\ sin^{2}\alpha +(-\frac{3}{5})^{2}=1\\ \\ sin^{2}\alpha+\frac{9}{25}=1\\ \\ sin^{2}\alpha =\frac{16}{25}\\ \\ sin\alpha =\frac{4}{5}\\ \\ tg\alpha =\frac{sin\alpha }{cos\alpha } =\frac{\frac{4}{5} }{-\frac{3}{5} }=\frac{4}{5}*(-\frac{5}{3})=-\frac{4}{3}[/tex]
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2. FAŁSZ