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sasha25ms
@sasha25ms
April 2021
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Вычислить без таблиц и калькуляторов
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Verified answer
Sin(240) = sin(180+60) = -sin(60) = -V3/2
cos(3pi/4) = cos(pi/2+45) = -sin(45) = -V2/2
ctg(-pi/6) = -ctg(pi/6) = -V3
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Answers & Comments
Verified answer
Sin(240) = sin(180+60) = -sin(60) = -V3/2cos(3pi/4) = cos(pi/2+45) = -sin(45) = -V2/2
ctg(-pi/6) = -ctg(pi/6) = -V3