Найдите значение производной функции в точке x0: а) f(x)=2tgx, x0= -3pi/4 б) f(x)=(4x+1)/(x+3), x0= -2 в) f(x)=корень из 4x-7, x0= 2 г) f(x)=sin(3x-pi/4), x0= pi/4 д) f(x)=tg6x, x0= pi/24

Лебедев Дмитрий Сергеевич

Учитель математики

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Значения производных функций в заданных точках составляют: а) 4, б) 11, в) 2, г) 0, д) 12. ️ Шаг 1: Вычисление производной для функции а) Для функции f(x)=2tanxf of x equals 2 tangent x используем правило дифференцирования тангенса: f(x)=2cos2xf prime of x equals 2 over cosine squared x end-fraction Подставим значение x0=3π4x sub 0 equals negative the fraction with numerator 3 pi and denominator 4 end-fraction : f(3π4)=2cos2(3π4)=2(22)2=224=4f prime of open paren negative the fraction with numerator 3 pi and denominator 4 end-fraction close paren equals the fraction with numerator 2 and denominator cosine squared open paren negative the fraction with numerator 3 pi and denominator 4 end-fraction close paren end-fraction equals the fraction with numerator 2 and denominator open paren negative the fraction with numerator the square root of 2 end-root and denominator 2 end-fraction close paren squared end-fraction equals 2 over two-fourths end-fraction equals 4 ️ Шаг 2: Вычисление производной для функции б) Для функции f(x)=4x+1x+3f of x equals the fraction with numerator 4 x plus 1 and denominator x plus 3 end-fraction применим правило производной 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 : f(x)=4(x+3)1(4x+1)(x+3)2=4x+124x1(x+3)2=11(x+3)2f prime of x equals the fraction with numerator 4 open paren x plus 3 close paren minus 1 open paren 4 x plus 1 close paren and denominator open paren x plus 3 close paren squared end-fraction equals the fraction with numerator 4 x plus 12 minus 4 x minus 1 and denominator open paren x plus 3 close paren squared end-fraction equals the fraction with numerator 11 and denominator open paren x plus 3 close paren squared end-fraction Подставим значение x0=-2x sub 0 equals negative 2: f(-2)=11(-2+3)2=1112=11f prime of negative 2 equals the fraction with numerator 11 and denominator open paren negative 2 plus 3 close paren squared end-fraction equals the fraction with numerator 11 and denominator 1 squared end-fraction equals 11 ️ Шаг 3: Вычисление производной для функции в) Для функции f(x)=4x7f of x equals the square root of 4 x minus 7 end-root используем правило производной сложной функции (u)=u2uopen paren the square root of u end-root close paren prime equals the fraction with numerator u prime and denominator 2 the square root of u end-root end-fraction : f(x)=424x7=24x7f prime of x equals the fraction with numerator 4 and denominator 2 the square root of 4 x minus 7 end-root end-fraction equals the fraction with numerator 2 and denominator the square root of 4 x minus 7 end-root end-fraction Подставим значение x0=2x sub 0 equals 2: f(2)=24(2)7=21=2f prime of 2 equals the fraction with numerator 2 and denominator the square root of 4 open paren 2 close paren minus 7 end-root end-fraction equals the fraction with numerator 2 and denominator the square root of 1 end-root end-fraction equals 2 ️ Шаг 4: Вычисление производной для функции г) Для функции f(x)=sin(3xπ4)f of x equals sine open paren 3 x minus the fraction with numerator pi and denominator 4 end-fraction close paren используем правило производной синуса и сложной функции: f(x)=cos(3xπ4)(3xπ4)=3cos(3xπ4)f prime of x equals cosine open paren 3 x minus the fraction with numerator pi and denominator 4 end-fraction close paren center dot open paren 3 x minus the fraction with numerator pi and denominator 4 end-fraction close paren prime equals 3 cosine open paren 3 x minus the fraction with numerator pi and denominator 4 end-fraction close paren Подставим значение x0=π4x sub 0 equals the fraction with numerator pi and denominator 4 end-fraction : f(π4)=3cos(3π4π4)=3cos(2π4)=3cos(π2)=30=0f prime of open paren the fraction with numerator pi and denominator 4 end-fraction close paren equals 3 cosine open paren 3 center dot the fraction with numerator pi and denominator 4 end-fraction minus the fraction with numerator pi and denominator 4 end-fraction close paren equals 3 cosine open paren the fraction with numerator 2 pi and denominator 4 end-fraction close paren equals 3 cosine open paren the fraction with numerator pi and denominator 2 end-fraction close paren equals 3 center dot 0 equals 0 ️ Шаг 5: Вычисление производной для функции д) Для функции f(x)=tan(6x)f of x equals tangent 6 x используем производную тангенса сложного аргумента: f(x)=1cos2(6x)(6x)=6cos2(6x)f prime of x equals 1 over cosine squared 6 x end-fraction center dot open paren 6 x close paren prime equals 6 over cosine squared 6 x end-fraction Подставим значение x0=π24x sub 0 equals the fraction with numerator pi and denominator 24 end-fraction : f(π24)=6cos2(6π24)=6cos2(π4)=6(22)2=612=12f prime of open paren the fraction with numerator pi and denominator 24 end-fraction close paren equals 6 over cosine squared open paren 6 center dot the fraction with numerator pi and denominator 24 end-fraction close paren end-fraction equals the fraction with numerator 6 and denominator cosine squared open paren the fraction with numerator pi and denominator 4 end-fraction close paren end-fraction equals the fraction with numerator 6 and denominator open paren the fraction with numerator the square root of 2 end-root and denominator 2 end-fraction close paren squared end-fraction equals 6 over one-half end-fraction equals 12 Ответ: а) 4, б) 11, в) 2, г) 0, д) 12. Требуются ли вам дополнительные пояснения по правилам дифференцирования сложных функций или применению тригонометрических формул в этих задачах?

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