   Chapter 15.5, Problem 14E

Chapter
Section
Textbook Problem

Find the area of the surface correct to four decimal places by expressing the area in terms of a single integral and using your calculator to estimate the integral.14. The part of the surface z = cos(x2 +y2) that lies inside the cylinder x2 + y2 = 1

To determine

To find: The area of given surface correct to four decimal places by using integrating calculator.

Explanation

Given:

The function, z=cos(x2+y2).

The region D lies inside the cylinder x2+y2=1.

Formula used:

The surface area with equation z=f(x,y),(x,y)D, where fx and fy are continuous, is A(S)D[fx(x,y)]2+[fy(x,y)]2+1dA, where D is the given region.

If f is a polar rectangle R given by 0arb,αθβ, where 0βα2π, then,

Rf(x,y)dA=αβabf(rcosθ,rsinθ)rdrdθ (1)

If g(x) is the function of x and h(y) is the function of y then,

abcdg(x)h(y)dydx=abg(x)dxcdh(y)dy (2)

Calculation:

Convert the given problems into the polar coordinates to make the problem easier. By the given the conditions, it is observed that, r varies from 0 to 1 and θ varies from 0 to 2π.

The partial derivatives fx and fy are,

fx=2xsin(x2+y2)fy=2ysin(x2+y2)

Then, by the equation (1), the area of surface is given by,

A(S)=D(2xsin(x2+y2))2+(2ysin(x2+y2))

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