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HW07-solutions (1).pdf - she (dhs935) – HW07 – clark –...

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1Thisprint-outshouldhave7questions.Multiple-choice questions may continue onthe next column or page – find all choicesbefore answering.00110.0points1.correct2.3.4.5.Explanation:
200210.0pointsFindlim(x,y)(9,3)xycos(x3y).1.27correct2.273.04.35.95.0Explanation:Rationalize the denominator:2(x2+y2)radicalbigx2+y2+ 42parenleftBiggradicalbig(x2+y2+ 22) + 2radicalbig(x2+y2+ 22) + 2parenrightBiggwhich now simplifies tox2+y2:2(x2+y2)[radicalbig(x2+y2+ 22) + 2](x2+y2)That factor also appears in the numerator,so they cancel on the domain of the originalfunction.
4.8correct
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Term
Fall
Professor
BartGoddard
Tags
Calculus, Derivative, lim, Continuous function

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