Среди приведенных величин положительной является:
1)sin[tex] \frac{ 4\pi }{3} [/tex]
2)cos[tex] \frac{ 14\pi }{15} [/tex]
3)tg[tex] \frac{ 8\pi }{9} [/tex]
4)cos[tex] \frac{ 9\pi }{8} [/tex]
5)sin[tex] \frac{ 4\pi }{5} [/tex]
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