Найти производную у=х/корень из х^2+1

Лебедев Дмитрий Сергеевич

Учитель математики

Проверено учителем

Для нахождения производной функции y=xx2+1y equals the fraction with numerator x and denominator the square root of x squared plus 1 end-root end-fraction воспользуемся правилом дифференцирования частного: (uv)=uvuvv2open paren u over v end-fraction close paren prime equals the fraction with numerator u prime v minus u v prime and denominator v squared end-fraction Шаг 1: Определение компонентов Пусть:

  • u=xu equals x, тогда u=1u prime equals 1 v=x2+1=(x2+1)1/2v equals the square root of x squared plus 1 end-root equals open paren x squared plus 1 close paren raised to the 1 / 2 power

Шаг 2: Производная знаменателя Для нахождения vv prime используем правило дифференцирования сложной функции: v=12(x2+1)-1/2(x2+1)=12x2+12x=xx2+1v prime equals one-half open paren x squared plus 1 close paren raised to the negative 1 / 2 power center dot open paren x squared plus 1 close paren prime equals the fraction with numerator 1 and denominator 2 the square root of x squared plus 1 end-root end-fraction center dot 2 x equals the fraction with numerator x and denominator the square root of x squared plus 1 end-root end-fraction Шаг 3: Подстановка в формулу частного y=1x2+1x(xx2+1)(x2+1)2y prime equals the fraction with numerator 1 center dot the square root of x squared plus 1 end-root minus x center dot open paren the fraction with numerator x and denominator the square root of x squared plus 1 end-root end-fraction close paren and denominator open paren the square root of x squared plus 1 end-root close paren squared end-fraction Шаг 4: Упрощение выражения

  1. Числитель: Приведем к общему знаменателю x2+1the square root of x squared plus 1 end-root :
    x2+1x2x2+1=(x2+1)2x2x2+1=x2+1x2x2+1=1x2+1the square root of x squared plus 1 end-root minus the fraction with numerator x squared and denominator the square root of x squared plus 1 end-root end-fraction equals the fraction with numerator open paren the square root of x squared plus 1 end-root close paren squared minus x squared and denominator the square root of x squared plus 1 end-root end-fraction equals the fraction with numerator x squared plus 1 minus x squared and denominator the square root of x squared plus 1 end-root end-fraction equals the fraction with numerator 1 and denominator the square root of x squared plus 1 end-root end-fraction Знаменатель: (x2+1)2=x2+1open paren the square root of x squared plus 1 end-root close paren squared equals x squared plus 1 Итоговая дробь:
    y=1x2+1x2+1=1(x2+1)x2+1y prime equals the fraction with numerator the fraction with numerator 1 and denominator the square root of x squared plus 1 end-root end-fraction and denominator x squared plus 1 end-fraction equals the fraction with numerator 1 and denominator open paren x squared plus 1 close paren center dot the square root of x squared plus 1 end-root end-fraction

Ответ: y=1(x2+1)3/2илиy=1(x2+1)3y prime equals the fraction with numerator 1 and denominator open paren x squared plus 1 close paren raised to the 3 / 2 power end-fraction space или space y prime equals the fraction with numerator 1 and denominator the square root of open paren x squared plus 1 close paren cubed end-root end-fraction Хотите, чтобы я нашел вторую производную этой функции или исследовал её на экстремумы?

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