АВ – хорда кола з центром у точці О. У цьому колі проведено радіус ОВ і радіус OD, який проходить через середину відрізка АВ – точку С. Кут ВОД дорівнює 70 градусів . Знайдіть кути трикутника ВСД
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y =(x²+4+196) /x ; x ∈ [-21 ; -1].
ООФ : x ≠ 0 * * * x ∈ (-∞ ; 0) ∪ ( 0 ; ∞) * * *
y =(x²+4+196) /x =x +210 / x ;
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y(- 21) = - 21 + 210 / (- 21) = -21 -10 = -31 ;.
y(- 1) = - 1 + 210 ) / (-1) =- 1 - 210 = - 211.
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определим критические точки функции :
y ' = ( x+210/ x ) ' = ( x+210 *( x ^(-1) ) '= 1- 210 / x² =(x²- 210 )/ x² ;
y ' =0 ⇒ x = (+/- )√210 ; x = √210 ≈14,5 ∉ [-21 ; -1].
значение функции в точке x = -√210 будет :
y(- √210) = - √210 + 210 ) / (- √210) = -2√210 ≈ -29 .
max {- 31 ;- 211 ; -2√210 } = -2√210 ≈ -29 .
ответ : -2√210 ≈ -29 .
* * * * * * * * * * * * * *
Допустим ( никому не вредим ) :
y =(x²+14)+196/ x ; x ∈ [-21 ; -1].
y(- 21) = (- 21 )² + 14 +196 / (- 21) = 455 -9 1/3 = 445 2/3 ;
y(- 1) = (- 1 )²+ 14 + 196 / (- 1) = 1 + 15 - 196 = - 180 .
критические точки функции :
y '= ( x²+14 +196/ x )' =2x -196/x² =2(x³ -98) / x²
y ' =0 ⇔2(x³-98) / x² = 0 ⇒ x = ∛ 98 ∉ [-24 ; -1].
max { 445 2/3 ; - 180 } = 445 2/3 .
ответ : 445 2/3 .
! Вариант автора оказался намного интересным .