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Alla [95]
3 years ago
8

The sketch shows two parallel lines cut by a transversal. Which set of angle pairs are NOT corresponding angles?

Mathematics
2 answers:
gayaneshka [121]3 years ago
8 0
They both aren't. because no right angles.
Mashutka [201]3 years ago
7 0

for TTM its angle 1 and 7


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Evaluate the integral below, where C is the curver(t) = ‹sin(t),cos(t), sin(2t)›, 0 ≤ t ≤2π. (Hint: Observe that C lies on the s
nordsb [41]

We can compute the integral directly: we have

\begin{cases}x(t)=\sin t\\y(t)=\cos t\\z(t)=\sin(2t)\end{cases}\implies\begin{cases}\mathrm dx=\cos t\,\mathrm dt\\\mathrm dy=-\sin t\,\mathrm dt\\\mathrm dz=2\cos(2t)\,\mathrm dt\end{cases}

Then the integral is

\displaystyle\int_C(y+9\sin x)\,\mathrm dx+(z^2+4\cos y)\,\mathrm dy+x^3\,\mathrm dz

=\displaystyle\int_0^{2\pi}\bigg((\cos t+9\sin(\sin t))\cos t-(\sin^2(2t)+4\cos(\cos t))\sin t+\sin^3t\bigg)\,\mathrm dt

=\displaystyle\int_0^{2\pi}\cos^2t+9\cos t\sin(\sin t)-\sin^2(2t)\sin t-4\sin t\cos(\cos t)+\sin^3t\,\mathrm dt

You could also take advantage of Stokes' theorem, which says the line integral of a vector field \vec F along a closed curve C is equal to the surface integral of the curl of \vec F over any surface S that has C as its boundary.

In this case, the underlying field is

\vec F(x,y,z)=\langle y+9\sin x,z^2+4\cos y,x^3\rangle

which has curl

\mathrm{curl}\vec F(x,y,z)=-\langle2z,3x^2,1\rangle

We can parameterize S by

\vec s(u,v)=\langle u\cos v,u\sin v,2u^2\cos v\sin v\rangle=\langle u\cos v,u\sin v,u^2\sin(2v)\rangle

with 0\le u\le1 and 0\le v\le2\pi.

Note that when viewed from above, C has negative orientation (a particle traveling on this path moves in a clockwise direction). Take the normal vector to S to be pointing downward, given by

\dfrac{\partial\vec s}{\partial v}\times\dfrac{\partial\vec s}{\partial u}=\langle2u^2\sin v,2u^2\cos v,-u\rangle

Then the integral is

\displaystyle\int_C\vec F\cdot\mathrm d\vec r=\iint_S\mathrm{curl}\vec F(x,y,z)\cdot\mathrm d\vec S

=\displaystyle\int_0^{2\pi}\int_0^1-\langle2u^2\sin(2v),3u^2\cos^2v,1\rangle\cdot\langle2u^2\sin v,2u^2\cos v,-u\rangle\,\mathrm du\,\mathrm dv

=\displaystyle-\int_0^{2\pi}\int_0^14u^4\sin(2v)\sin v+6u^4\cos^3v-u\,\mathrm du\,\mathrm dv

Both integrals are kind of tedious to compute, but personally I prefer the latter method. Either way, you end up with a value of \boxed\pi.

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