The length of the sides of an isosceles triangle are \( 9+x^{2}, 9+...

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The length of the sides of an isosceles triangle are \( 9+x^{2}, 9+x^{2} \) and \( 18-2 x^{2} \) units. Calculate the area
P of the triangle in terms of \( x \) and find the value of \( x \) which makes the area maximum.

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