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MaryFins
@MaryFins
July 2022
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Найдите значение выражения sin^a * tg a - cos^a,если sin a=1/3
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erzhan9210
SinA=1/3
cosA=√(1-sin²a)=√(1-1/9)=√(8/9)=2√2/3
sina*tga-cosa=sin²a/cosa-cosa=(sin²a-cos²a)/cosa=(1/9-8/9)/(2√2/3)=-7/9*3/2√2=-7/6√2=-7√2/12
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Thanks 1
MaryFins
Знак ^ означает квадрат)
erzhan9210
степень
erzhan9210
3^4 это три в четвёртой степени
MaryFins
извини,я когда писала,знак поставила такой,но имела ввиду квадрат
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Answers & Comments
cosA=√(1-sin²a)=√(1-1/9)=√(8/9)=2√2/3
sina*tga-cosa=sin²a/cosa-cosa=(sin²a-cos²a)/cosa=(1/9-8/9)/(2√2/3)=-7/9*3/2√2=-7/6√2=-7√2/12