The Slope of The Slope: Second Derivatives
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The second derivatives create their own graph, which is distinct from the original function’s graph. This graph, often called the “second derivative graph” or “concavity graph,” visually represents the rate at which the slope of the original function changes. It helps in understanding the curvature behavior of the original function, indicating where it’s concave up or down, and locating any inflection points where the concavity changes. For additional educational resources,.
Since you are already equipped with the tools required to solve the problems involving the second derivative,
let’s dive into problems:
\( \text{Find the first and second derivatives of } f(x) = x \sin x. \)
\( u = x, \ u’ = 1 \)
\( v = \sin x, \ v’ = \cos x \)
\( f'(x) = 1 \cdot \sin x + x \cdot \cos x \)
\( f'(x) = \sin x + x \cos x \)
\( (\sin x)’ = \cos x \)
\( (x \cos x)’ = 1 \cdot \cos x + x \cdot (-\sin x) \)
\( (x \cos x)’ = \cos x – x \sin x \)
\( f”(x) = \cos x + \cos x – x \sin x \)
\( f”(x) = 2\cos x – x \sin x \)
And that’s the second derivative of \( xsin x \)
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