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Ele0000
@Ele0000
October 2021
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Помогите любые номера решите
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nKrynka
Решение
B2
(sin2x/cosx)*sinx = (2sinx*cosx*sinx)/cosx = 2sin²x
B5
y = 5/x
y` = - 5/x²
y = 8√x + 0,5cosx
y` = 8/2√x - 0,5sinx = 4
/√x - 0,5sinx =
B7
f(x) = 81x - 3x³
f`(x) = 81 - 9x²
81 - 9x² < 0
9x² > 81
x² > 9
x² - 9 > 0
x² - 9 = 0
x² = 9
x₁ = - 3
x₂ = 3
+ - +
-//////////////----------------////////////////--->
-∞ - 3 3 +∞ x
x∈ (- ∞; - 3)∪(3; + ∞)
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Answers & Comments
B2
(sin2x/cosx)*sinx = (2sinx*cosx*sinx)/cosx = 2sin²x
B5
y = 5/x
y` = - 5/x²
y = 8√x + 0,5cosx
y` = 8/2√x - 0,5sinx = 4/√x - 0,5sinx =
B7
f(x) = 81x - 3x³
f`(x) = 81 - 9x²
81 - 9x² < 0
9x² > 81
x² > 9
x² - 9 > 0
x² - 9 = 0
x² = 9
x₁ = - 3
x₂ = 3
+ - +
-//////////////----------------////////////////--->
-∞ - 3 3 +∞ x
x∈ (- ∞; - 3)∪(3; + ∞)