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хахатулька
@хахатулька
August 2022
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Найдите значение выражения:
Sin(270°-B),если соsb=-0.41
a)-1,5
b)0,41
c)-0,24
d)0,28
2)найдите область определения
У=корень х^2-4/х+2
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Answers & Comments
pomoshnik09
1)sin(270-b)=-cos b=-(-0.41)=0.41
2) x²-4x+2≥0
D=4²-4*2=8
x=(4+√8)/2=2*(2+√2)/2=2+√2
x2=2-√2
x∈(-∞. 2-√2) (2+√2 ∞)
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Answers & Comments
2) x²-4x+2≥0
D=4²-4*2=8
x=(4+√8)/2=2*(2+√2)/2=2+√2
x2=2-√2
x∈(-∞. 2-√2) (2+√2 ∞)