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Катеринович
@Катеринович
August 2022
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Найдите значение числового выражения: -cos720° + tg30° - ctg210° + sin120°.
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МСтер
-cos720+tg 30 ctg 210+sin 120 = -сos2*360° + tg30°ctg(180° + 30°) + + sin(90° + 30)° = -1 + 1/√3*ctg30° + sin30° = -1 + (1/√3)*(√3) + 1/2 = -1 + 1 + 1/2 = (1/2)tg0 °- 2ctg90° - sin0° - 3cos90° = 0 - 2*0 - 0 - 3*0 = 0
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