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

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Sec. 5]_Cont<strong>in</strong>uity of Functions_39<br />

305. Prove that the rational <strong>in</strong>tegral tunction<br />

is cont<strong>in</strong>uous for any value of x.<br />

306. Prove that the rational fractional function<br />

is cont<strong>in</strong>uous for all values of x exce<strong>pt</strong> those that make the denom<strong>in</strong>ator<br />

zero.<br />

307*. Prove that the function y = Yx<br />

is cont<strong>in</strong>uous for x&zQ.<br />

308. Prove that if the function f (x) is cont<strong>in</strong>uous and non-<br />

negative <strong>in</strong> the <strong>in</strong>terval (a, 6),<br />

then the function<br />

is likewise cont<strong>in</strong>uous <strong>in</strong> this <strong>in</strong>terval.<br />

309*. Prove that the function y<br />

310. For what values of x are<br />

cos x is cont<strong>in</strong>uous for any x.<br />

the functions a) tan* and<br />

b) cotjc cont<strong>in</strong>uous?<br />

311*. Show that the function # = |#|<br />

is cont<strong>in</strong>uous. Plot the<br />

graph of this function.<br />

312. Prove that the absolute value of a cont<strong>in</strong>uous function<br />

is a cont<strong>in</strong>uous function.<br />

313. A function is def<strong>in</strong>ed by the formulas<br />

How should one choose the value of the function A=f(2) so<br />

that the thus redef<strong>in</strong>ed function f(x) is cont<strong>in</strong>uous for # = 2?<br />

Plot the graph of the function y = f(x).<br />

314. The right side of the equation<br />

f(x) = lx s<strong>in</strong><br />

is mean<strong>in</strong>gless for x = 0. How should one choose the value /(O)<br />

so that f(x) is cont<strong>in</strong>uous for jc = 0?<br />

315. The function<br />

f(*) = arctan--^<br />

is mean<strong>in</strong>gless for x=--2. Is it possible to def<strong>in</strong>e the value of /(2)<br />

<strong>in</strong> such a way that the redef<strong>in</strong>ed function should be cont<strong>in</strong>uous<br />

for jc = 2?

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