Для функции y=f(x) найдите первообразную: 1)f(x)=-1\x^2 2)f(x)=sin(3x +п\6) 3)f(x)=-1\(6x+1)^2 4)f(x)=1\коень 7x -9

Лебедев Дмитрий Сергеевич

Учитель математики

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Общие первообразные для данных функций имеют вид: 1) F(x)=1x+Cbold cap F open paren bold x close paren equals the fraction with numerator 1 and denominator bold x end-fraction plus bold cap C ; 2) F(x)=13cos(3x+π6)+Cbold cap F open paren bold x close paren equals negative one-third cosine open paren 3 bold x plus the fraction with numerator bold pi and denominator 6 end-fraction close paren plus bold cap C ; 3) F(x)=16(6x+1)+Cbold cap F open paren bold x close paren equals the fraction with numerator 1 and denominator 6 open paren 6 bold x plus 1 close paren end-fraction plus bold cap C ; 4) F(x)=277x9+Cbold cap F open paren bold x close paren equals two-sevenths the square root of 7 bold x minus 9 end-root plus bold cap C . ️ Шаг 1: Нахождение первообразной степенной функции Для функции f(x)=x-2f of x equals negative x to the negative 2 power применим базовую формулу xndx=xn+1n+1+Cintegral of x to the n-th power d x equals the fraction with numerator x raised to the n plus 1 power and denominator n plus 1 end-fraction plus cap C . F(x)=x-2+1-2+1+C=x-1-1+C=1x+Ccap F open paren x close paren equals negative the fraction with numerator x raised to the negative 2 plus 1 power and denominator negative 2 plus 1 end-fraction plus cap C equals negative the fraction with numerator x to the negative 1 power and denominator negative 1 end-fraction plus cap C equals 1 over x end-fraction plus cap C ️ Шаг 2: Интегрирование тригонометрической функции с линейным аргументом Для f(x)=sin(kx+b)f of x equals sine open paren k x plus b close paren первообразная вычисляется по правилу F(x)=1kcos(kx+b)+Ccap F open paren x close paren equals negative 1 over k end-fraction cosine open paren k x plus b close paren plus cap C . Здесь k=3k equals 3, b=π6b equals the fraction with numerator pi and denominator 6 end-fraction . F(x)=13cos(3x+π6)+Ccap F open paren x close paren equals negative one-third cosine open paren 3 x plus the fraction with numerator pi and denominator 6 end-fraction close paren plus cap C ️ Шаг 3: Вычисление для сложной функции с отрицательной степенью Функцию f(x)=1(6x+1)2f of x equals negative the fraction with numerator 1 and denominator open paren 6 x plus 1 close paren squared end-fraction представим как (6x+1)-2negative open paren 6 x plus 1 close paren to the negative 2 power. Применяем формулу для f(kx+b)f of open paren k x plus b close paren: F(x)=16(6x+1)-2+1-2+1+C=16(6x+1)-1-1+C=16(6x+1)+Ccap F open paren x close paren equals negative one-sixth center dot the fraction with numerator open paren 6 x plus 1 close paren raised to the negative 2 plus 1 power and denominator negative 2 plus 1 end-fraction plus cap C equals negative one-sixth center dot the fraction with numerator open paren 6 x plus 1 close paren to the negative 1 power and denominator negative 1 end-fraction plus cap C equals the fraction with numerator 1 and denominator 6 open paren 6 x plus 1 close paren end-fraction plus cap C ️ Шаг 4: Нахождение первообразной иррациональной функции Запишем f(x)=17x9f of x equals the fraction with numerator 1 and denominator the square root of 7 x minus 9 end-root end-fraction в виде (7x9)12open paren 7 x minus 9 close paren raised to the negative one-half power . Используем то же правило линейного аргумента: F(x)=17(7x9)12+112+1+C=17(7x9)1212+C=277x9+Ccap F open paren x close paren equals one-seventh center dot the fraction with numerator open paren 7 x minus 9 close paren raised to the negative one-half plus 1 power and denominator negative one-half plus 1 end-fraction plus cap C equals one-seventh center dot the fraction with numerator open paren 7 x minus 9 close paren raised to the one-half power and denominator one-half end-fraction plus cap C equals two-sevenths the square root of 7 x minus 9 end-root plus cap C Ответ:

  1. F(x)=1x+Cbold cap F open paren bold x close paren equals the fraction with numerator 1 and denominator bold x end-fraction plus bold cap C F(x)=13cos(3x+π6)+Cbold cap F open paren bold x close paren equals negative one-third cosine open paren 3 bold x plus the fraction with numerator bold pi and denominator 6 end-fraction close paren plus bold cap C F(x)=16(6x+1)+Cbold cap F open paren bold x close paren equals the fraction with numerator 1 and denominator 6 open paren 6 bold x plus 1 close paren end-fraction plus bold cap C F(x)=277x9+Cbold cap F open paren bold x close paren equals two-sevenths the square root of 7 bold x minus 9 end-root plus bold cap C

Нужно ли вам найти значение постоянной интегрирования Ccap C для конкретной точки, через которую проходит график одной из этих функций?

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