Найти производные dy/dx заданных функций: а) y= (2x+1)^1/4 б) y=ln(3x - 5) * e^-2x в) y=(2x+5)/(1 + sin2x) г) y=arctgx^3

Лебедев Дмитрий Сергеевич

Учитель математики

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Производные заданных функций: а) dydx=12(2x+1)3/4the fraction with numerator bold d bold y and denominator bold d bold x end-fraction equals the fraction with numerator 1 and denominator 2 open paren 2 bold x plus 1 close paren raised to the 3 / 4 power end-fraction ; б) dydx=e-2x(33x52ln(3x5))the fraction with numerator bold d bold y and denominator bold d bold x end-fraction equals bold e raised to the negative 2 bold x power open paren the fraction with numerator 3 and denominator 3 bold x minus 5 end-fraction minus 2 l n open paren 3 bold x minus 5 close paren close paren ; в) dydx=2(1+sin2x)2(2x+5)cos2x(1+sin2x)2the fraction with numerator bold d bold y and denominator bold d bold x end-fraction equals the fraction with numerator 2 open paren 1 plus sine 2 bold x close paren minus 2 open paren 2 bold x plus 5 close paren cosine 2 bold x and denominator open paren 1 plus sine 2 bold x close paren squared end-fraction ; г) dydx=3x21+x6the fraction with numerator bold d bold y and denominator bold d bold x end-fraction equals the fraction with numerator 3 bold x squared and denominator 1 plus bold x to the sixth power end-fraction . ️ Шаг 1: Дифференцирование степенной функции Для функции y=(2x+1)1/4y equals open paren 2 x plus 1 close paren raised to the 1 / 4 power используем правило производной сложной функции ddx[un]=nun1ud over d x end-fraction open bracket u to the n-th power close bracket equals n u raised to the n minus 1 power center dot u prime .

  1. Внешняя функция: u1/4u raised to the 1 / 4 power, её производная 14u-3/4one-fourth u raised to the negative 3 / 4 power . Внутренняя функция: u=2x+1u equals 2 x plus 1, её производная u=2u prime equals 2. Итого: dydx=14(2x+1)-3/42=12(2x+1)3/4d y over d x end-fraction equals one-fourth open paren 2 x plus 1 close paren raised to the negative 3 / 4 power center dot 2 equals the fraction with numerator 1 and denominator 2 open paren 2 x plus 1 close paren raised to the 3 / 4 power end-fraction .

️ Шаг 2: Дифференцирование произведения функций Для функции y=ln(3x5)e-2xy equals l n open paren 3 x minus 5 close paren center dot e raised to the negative 2 x power используем правило (uv)=uv+uvopen paren u v close paren prime equals u prime v plus u v prime.

  1. u=ln(3x5)u=13x53=33x5u equals l n open paren 3 x minus 5 close paren implies u prime equals the fraction with numerator 1 and denominator 3 x minus 5 end-fraction center dot 3 equals the fraction with numerator 3 and denominator 3 x minus 5 end-fraction . v=e-2xv=e-2x(-2)=-2e-2xv equals e raised to the negative 2 x power implies v prime equals e raised to the negative 2 x power center dot open paren negative 2 close paren equals negative 2 e raised to the negative 2 x power. Собираем вместе: dydx=33x5e-2x+ln(3x5)(-2e-2x)=e-2x(33x52ln(3x5))d y over d x end-fraction equals the fraction with numerator 3 and denominator 3 x minus 5 end-fraction center dot e raised to the negative 2 x power plus l n open paren 3 x minus 5 close paren center dot open paren negative 2 e raised to the negative 2 x power close paren equals e raised to the negative 2 x power open paren the fraction with numerator 3 and denominator 3 x minus 5 end-fraction minus 2 l n open paren 3 x minus 5 close paren close paren .

️ Шаг 3: Дифференцирование частного Для функции y=2x+51+sin2xy equals the fraction with numerator 2 x plus 5 and denominator 1 plus sine 2 x end-fraction используем правило (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 .

  1. u=2x+5u=2u equals 2 x plus 5 implies u prime equals 2. v=1+sin2xv=cos2x2=2cos2xv equals 1 plus sine 2 x implies v prime equals cosine 2 x center dot 2 equals 2 cosine 2 x. Подставляем: dydx=2(1+sin2x)(2x+5)(2cos2x)(1+sin2x)2d y over d x end-fraction equals the fraction with numerator 2 open paren 1 plus sine 2 x close paren minus open paren 2 x plus 5 close paren open paren 2 cosine 2 x close paren and denominator open paren 1 plus sine 2 x close paren squared end-fraction .

️ Шаг 4: Дифференцирование обратной тригонометрической функции Для функции y=arctg(x3)y equals arctg open paren x cubed close paren используем правило ddx[arctg(u)]=11+u2ud over d x end-fraction open bracket arctg open paren u close paren close bracket equals the fraction with numerator 1 and denominator 1 plus u squared end-fraction center dot u prime .

  1. u=x3u2=x6u equals x cubed implies u squared equals x to the sixth power. u=3x2u prime equals 3 x squared. Итого: dydx=11+(x3)23x2=3x21+x6d y over d x end-fraction equals the fraction with numerator 1 and denominator 1 plus open paren x cubed close paren squared end-fraction center dot 3 x squared equals the fraction with numerator 3 x squared and denominator 1 plus x to the sixth power end-fraction .

Ответ: а) dydx=12(2x+1)3/4the fraction with numerator bold d bold y and denominator bold d bold x end-fraction equals the fraction with numerator 1 and denominator 2 open paren 2 bold x plus 1 close paren raised to the 3 / 4 power end-fraction б) dydx=e-2x(33x52ln(3x5))the fraction with numerator bold d bold y and denominator bold d bold x end-fraction equals bold e raised to the negative 2 bold x power open paren the fraction with numerator 3 and denominator 3 bold x minus 5 end-fraction minus 2 l n open paren 3 bold x minus 5 close paren close paren в) dydx=2+2sin2x(4x+10)cos2x(1+sin2x)2the fraction with numerator bold d bold y and denominator bold d bold x end-fraction equals the fraction with numerator 2 plus 2 sine 2 bold x minus open paren 4 bold x plus 10 close paren cosine 2 bold x and denominator open paren 1 plus sine 2 bold x close paren squared end-fraction г) dydx=3x21+x6the fraction with numerator bold d bold y and denominator bold d bold x end-fraction equals the fraction with numerator 3 bold x squared and denominator 1 plus bold x to the sixth power end-fraction Требуется ли вам помощь с поиском экстремумов данных функций или проведением полного исследования их графиков?

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