Вычислите при помощи формул приведения
а) [tex]cos \frac{16 \pi }{3} +tg 225^{0} -sin \frac{19 \pi }{6} [/tex]
б) [tex]cos 750^{0} *tg 510^{0} +ctg(- 120^{0} )[/tex]
в) [tex]sin \frac{16 \pi }{3} -ctg(- \frac{55 \pi }{6} )[/tex]

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