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LekaFEV [45]
3 years ago
11

Find the area of the surface. the part of the surface y = 5x + z2 that lies between the planes x = 0, x = 1, z = 0, and z = 1.

Mathematics
1 answer:
Alex787 [66]3 years ago
7 0

Parameterize the part of the surface we care about, denoted \mathcal S, by

\mathbf r(u,v)=\langle u,5u+v^2,v\rangle

with 0\le u\le1 and 0\le v\le1.

Then

\|\mathbf r_u\times\mathbf r_v\|=\|\langle5,-1,2v\rangle\|=\sqrt{4v^2+26}

The area is given by the surface integral

\displaystyle\iint_{\mathcal S}\mathrm dS=\int_{v=0}^{v=1}\int_{u=0}^{u=1}\|\mathbf r_u\times\mathbf r_v\|\,\mathrm du\,\mathrm dv

=\displaystyle\int_{v=0}^{v=1}\sqrt{4v^2+26}\,\mathrm dv=\sqrt{\dfrac{15}2}+\dfrac{13}2\sinh^{-1}\sqrt{\dfrac2{13}}

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