определите какой четверти принадлежит угол и сравните выражение с нулём:
А)
[tex]ctg( - 108 {}^{0} )[/tex]
Б)
[tex] \sin \frac{9\pi}{4} [/tex]
В)
[tex] \cos \frac{23\pi}{8} [/tex]
Г)
[tex] \tg9\pi[/tex]
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