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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<br />

334. a) y = sgnx, b) y = x sgnx, c) i/ = sgn(s<strong>in</strong>jt), where the<br />

function sgn x is def<strong>in</strong>ed by the formulas:<br />

sgn x = {<br />

I + 1, if *>0,<br />

[ -1, if *

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