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Find the derivative of y y with respect to θ \theta : y=(55θ)tanh1(θ) y = (5 - 5\theta)\tanh^{-1}(\theta)

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Q. Find the derivative of y y with respect to θ \theta : y=(55θ)tanh1(θ) y = (5 - 5\theta)\tanh^{-1}(\theta)
  1. Apply Product Rule: Apply the product rule for differentiation.\newlineThe product rule states that the derivative of a product of two functions is the derivative of the first function times the second function plus the first function times the derivative of the second function.\newlineLet u=(55θ)u = (5 - 5\theta) and v=tanh1θv = \tanh^{-1}\theta.\newlineThen, dydθ=dudθv+udvdθ\frac{dy}{d\theta} = \frac{du}{d\theta} \cdot v + u \cdot \frac{dv}{d\theta}.
  2. Differentiate uu: Differentiate u=(55θ)u = (5 - 5\theta) with respect to θ\theta. The derivative of a constant is 00, and the derivative of 5θ-5\theta with respect to θ\theta is 5-5. So, dudθ=5\frac{du}{d\theta} = -5.
  3. Differentiate vv: Differentiate v=tanh1θv = \tanh^{-1}\theta with respect to θ\theta. The derivative of tanh1θ\tanh^{-1}\theta with respect to θ\theta is 11θ2\frac{1}{1 - \theta^2}, due to the inverse hyperbolic tangent derivative formula. So, dvdθ=11θ2\frac{dv}{d\theta} = \frac{1}{1 - \theta^2}.
  4. Substitute Derivatives: Substitute the derivatives back into the product rule formula.\newlinedydθ=(5)tanh1(θ)+(55θ)(11θ2).\frac{dy}{d\theta} = (-5) \cdot \tanh^{-1}(\theta) + (5 - 5\theta) \cdot \left(\frac{1}{1 - \theta^2}\right).
  5. Simplify Expression: Simplify the expression. dydθ=5tanh1(θ)+(51θ2)(5θ1θ2)\frac{dy}{d\theta} = -5 \cdot \tanh^{-1}(\theta) + \left(\frac{5}{1 - \theta^2}\right) - \left(\frac{5\theta}{1 - \theta^2}\right).

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