3.6 The Chain Rule We know how to differentiate sinx and x² - 4, but how do we differentiate a composite like sin (x² - 4)? –The answer is the Chain Rule.

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Presentation transcript:

3.6 The Chain Rule We know how to differentiate sinx and x² - 4, but how do we differentiate a composite like sin (x² - 4)? –The answer is the Chain Rule. The Chain Rule is probably the most widely used differentiation rule in mathematics.

Relating Derivatives The function y = 6x – 10 = 2 (3x – 5) is the composite of the functions y = 2u and u = 3x – 5. How are the derivatives of these functions related? We have: Since 6 = 2 ∙ 3,

Relating Derivatives The polynomial y = 9x 4 + 6x² + 1 = (3x² + 1)² is the composite of y = u² and u = 3x² + 1. Calculating derivatives we see that: Also, Once again,

The derivative of the composite function f(g(x)) at x is the derivative of f at g(x) times the derivative of g at x. –This is known as the Chain Rule.

The Chain Rule

Applying the Chain Rule An object moves along the x-axis so that its position at any time t ≥ 0 is given by x(t) = cos(t² + 1). Find the velocity of the object as a function of t.

“Outside-Inside Rule” When you are using the Chain Rule, differentiate the “outside” function f and evaluate it at the “inside” function g(x) left alone. –Then multiply by the derivative of the “inside function”.

Differentiating from the Outside In Differentiate sin(x² + x) with respect to x.

A Three-Link “Chain” Find the derivative of g(t) = tan (5 – sin 2t).

Slopes of Parametrized Curves A parametrized curve (x(t), y(t)) is differentiable at t if x and y are differentiable at t. At a point on a differentiable parametrized curve where y is also a differentiable function of x, the derivatives dy/dt, dx/dt, and dy/dx are related by the Chain Rule: If dx/dt ≠ 0, we may divide both sides of this equation by dx/dt to solve for dy/dx.

Differentiating with a Parameter Find the line tangent to the right-hand hyperbola branch defined parametrically by at the point

Differentiating with a Parameter All three of the derivatives in Equation 3 exist and dx/dt = sec t tan t ≠ 0 at the indicated point. Therefore, equation 3 applies and: Setting The equation of the tangent line is:

Power Chain Rule

Finding Slope (A) Find the slope of the line tangent to the curve y = sin 5 x at the point where (B) Show that the slope of every line tangent to the curve y = 1 / (1 – 2x)³ is positive.

Finding Slope (B)

Radians vs. Degrees See Example 8 on page 152 in textbook.

More Practice!!!!! Homework – Textbook p. 153 #1 – 12, 33 – 38 ALL.