1)Найти [tex]sin \alpha [/tex] и [tex]tg \alpha [/tex], если [tex]cos \alpha =- \frac{2}{5} [/tex] и [tex] \pi \ \textless \ \alpha \ \textless \ \frac{3 \pi }{2} [/tex]
2) Найти [tex]cos \alpha [/tex] и [tex]ctg \alpha [/tex], если [tex]sin \alpha = \frac{3}{4} [/tex]
и [tex] \frac{ \pi }{2} \ \textless \ \alpha \ \textless \ \pi [/tex]
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