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What is the equation of the tangent to the curve:𝑦=𝑥2−1𝑥2+1y= x 2 +1x 2 −1​ y, equals, start fraction, x, squared, minus, 1, divided by, x, squared, plus, 1, end fractionat the point where 𝑥=1x=1x, equals, 1?

Question

What is the equation of the tangent to the curve:𝑦=𝑥2−1𝑥2+1y= x 2 +1x 2 −1​ y, equals, start fraction, x, squared, minus, 1, divided by, x, squared, plus, 1, end fractionat the point where 𝑥=1x=1x, equals, 1?

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Solution

Para encontrar la ecuación de la tangente a la curva y=x21x2+1 y = \frac{x^2 - 1}{x^2 + 1} en el punto donde x=1 x = 1 , sigue estos pasos:

  1. Encuentra el valor de y y en x=1 x = 1 : y=12112+1=02=0 y = \frac{1^2 - 1}{1^2 + 1} = \frac{0}{2} = 0 Entonces, el punto de tangencia es (1,0) (1, 0) .

  2. Calcula la derivada de y y con respecto a x x : Utiliza la regla del cociente para derivar y=uv y = \frac{u}{v} , donde u=x21 u = x^2 - 1 y v=x2+1 v = x^2 + 1 . y=vuuvv2 y' = \frac{v \cdot u' - u \cdot v'}{v^2} Primero, encuentra las derivadas de u u y v v : u=ddx(x21)=2x u' = \frac{d}{dx}(x^2 - 1) = 2x v=ddx(x2+1)=2x v' = \frac{d}{dx}(x^2 + 1) = 2x Ahora, sustituye u u , v v , u u' y v v' en la fórmula de la derivada: y=(x2+1)(2x)(x21)(2x)(x2+1)2 y' = \frac{(x^2 + 1)(2x) - (x^2 - 1)(2x)}{(x^2 + 1)^2} Simplifica el numerador: y=2x(x2+1)2x(x21)(x2+1)2=2x3+2x2x3+2x(x2+1)2=4x(x2+1)2 y' = \frac{2x(x^2 + 1) - 2x(x^2 - 1)}{(x^2 + 1)^2} = \frac{2x^3 + 2x - 2x^3 + 2x}{(x^2 + 1)^2} = \frac{4x}{(x^2 + 1)^2}

  3. Evalúa la derivada en x=1 x = 1 : y(1)=4(1)(12+1)2=422=44=1 y'(1) = \frac{4(1)}{(1^2 + 1)^2} = \frac{4}{2^2} = \frac{4}{4} = 1 La pendiente de la tangente en x=1 x = 1 es 1.

  4. Escribe la ecuación de la tangente: Utiliza la fórmula de la recta tangente yy1=m(xx1) y - y_1 = m(x - x_1) , donde (x1,y1)=(1,0) (x_1, y_1) = (1, 0) y m=1 m = 1 : y0=1(x1) y - 0 = 1(x - 1) Simplifica: y=x1 y = x - 1

Por lo tanto, la ecuación de la tangente a la curva en el punto donde x=1 x = 1 es y=x1 y = x - 1 .

This problem has been solved

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