31. An alternative derivation of the surface area formula Assume f is smooth on [a, b] and partition [a, b] in the usual way. In the kth subinterval [Xx-1, Xx], construct the tangent line to the curve at the midpoint m = (xg-1 + xx)/2, as in the accompany- ing figure. a. Show that Δx. n = f(m;) – f'(m;) and n = f(m;) + f'(m;). Δxε b. Show that the length Lỵ of the tangent line segment in the kth subinterval is Lį = V(Ax)² + (f"(m²) Ax4)². y = f(x) r2 х Xk-1 тe -Ax

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31. An alternative derivation of the surface area formula
Assume
f is smooth on [a, b] and partition [a, b] in the usual way. In
the kth subinterval [Xx-1, Xx], construct the tangent line to the
curve at the midpoint m = (xg-1 + xx)/2, as in the accompany-
ing figure.
a. Show that
Δx.
n = f(m;) – f'(m;) and n = f(m;) + f'(m;).
Δxε
b. Show that the length Lỵ of the tangent line segment in the kth
subinterval is Lį = V(Ax)² + (f"(m²) Ax4)².
y = f(x)
r2
х
Xk-1
тe
-Ax
Transcribed Image Text:31. An alternative derivation of the surface area formula Assume f is smooth on [a, b] and partition [a, b] in the usual way. In the kth subinterval [Xx-1, Xx], construct the tangent line to the curve at the midpoint m = (xg-1 + xx)/2, as in the accompany- ing figure. a. Show that Δx. n = f(m;) – f'(m;) and n = f(m;) + f'(m;). Δxε b. Show that the length Lỵ of the tangent line segment in the kth subinterval is Lį = V(Ax)² + (f"(m²) Ax4)². y = f(x) r2 х Xk-1 тe -Ax
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