1.

Consider the circular region x2 + y2 = 81, What is the maximum value of the function

A. = x<sup>6</sup> + y<sup>2</sup>(3x<sup>4</sup> + 1) + x<sup>2</sup>.(3y<sup>4</sup> + 1) + y<sup>6</sup>
B. 90
C. 80
D. 81 + 81<sup>3</sup>
Answer» D. 81 + 81<sup>3</sup>


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