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Web skærmformat. - Aarhus Universitet

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I. Differentiation – 4. Kædereglen 81<br />

Beregn us.<br />

d(u) = ur us<br />

<br />

ut<br />

= ⎛<br />

ux uy<br />

<br />

uz ⎝<br />

xr xs xt<br />

yr ys yt<br />

zr zs zt<br />

4.21. Matrixprodukt ☞ [S] 11.5 The chain rule<br />

Eksempel 5 (Matrixform) - fortsat<br />

Svaret er<br />

u = x 4 y + y 2 z 3 , x = rse t , y = rs 2 e −t , z = r 2 ssin t<br />

ur us ut<br />

<br />

⎛<br />

= 4x3y x4 + 2yz3 3y2z2 ⎝<br />

⎞<br />

⎠<br />

set ret rset s2e−t 2rse−t −rs2e−t 2rssin t r2 sint r2scos t<br />

us = 4x 3 yre t + (x 4 + 2yz 3 )2rse −t + 3y 2 z 2 r 2 sin t<br />

4.22. Test matrixform ☞ [S] 11.5 The chain rule<br />

⎞<br />

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