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KiraraK
@KiraraK
July 2022
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Вычислите, используя формулы приведения: cos150, sin135, cctg240, cos210
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Answers & Comments
belozerova1955
Cos150°=cos(90°+60°)=cos(π/2 +60°)= - sin60°= - √3/2
sin135°=sin(90°+45°)=sin(π/2+45°)= cos45°=√2/2
ctg240°=ctg(180°+60°)=ctg(π+60°)=ctg60°= 1/√3
cos210°=cos(180°+30°) = cos(π+30°) = - cos30° = - √3/2
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Answers & Comments
sin135°=sin(90°+45°)=sin(π/2+45°)= cos45°=√2/2
ctg240°=ctg(180°+60°)=ctg(π+60°)=ctg60°= 1/√3
cos210°=cos(180°+30°) = cos(π+30°) = - cos30° = - √3/2