1.

Stationary point is a point where, function f(x,y) have?

A. <sup> f</sup> <sub> x</sub> = 0
B. <sup> f</sup> <sub> y</sub> = 0
C. <sup> f</sup> <sub> x</sub> = 0 &amp; <sup> f</sup> <sub> y</sub> = 0
D. <sup> f</sup> <sub> x</sub> &lt; 0 and <sup> f</sup> <sub> y</sub> &gt; 0
Answer» D. <sup> f</sup> <sub> x</sub> &lt; 0 and <sup> f</sup> <sub> y</sub> &gt; 0


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