Сравните значение выражения с нулем:
а) sin 121 °. sin 153 °; б) cos 310 ° - sin 115 °; г) cos 300 °. ctg 130.
б) cos 260 ° - cos 315 °; в) tg 115 ° - sin 172 °; е) tg 78 °. ctg 1900​
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