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Problems in Mathematical Analysis.pdf - pwp.net.ipl.pt

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190_Functions of Several Variables_[Ch. 6<br />

where / is the length of the pendulum and g is the acceleration<br />

of gravity. F<strong>in</strong>d the error, when determ<strong>in</strong><strong>in</strong>g T, obta<strong>in</strong>ed as a<br />

result of small errors A/ = a and Ag = (J <strong>in</strong> measur<strong>in</strong>g / and g.<br />

1855. The distance between the po<strong>in</strong>ts P (* , V and P (x, y)<br />

is equal to Q, while the angle formed by the vector P P with<br />

the x-axis is a. By how much will the angle a change if the<br />

po<strong>in</strong>t P(P is fixed) moves to P l (x + dx, y + dy)?<br />

Sec. 5. Differentiation of Composite Functions<br />

1. The case of one <strong>in</strong>dependent variable* If z function of the arguments x and y, which <strong>in</strong><br />

f(x, y) is a differentiate<br />

turn are differentiate functions<br />

of an <strong>in</strong>dependent variable /,<br />

then the derivative of the composite function z = puted from the formula<br />

/[

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