Find an equation of the plane tangent to the following surface at the given points. z=ln(1+xy)​; (5,5,ln26) and (−5,−5,ln26) a)The tangent plane at (5,5,ln26) is z=??. b) The tangent plane at (-5, -5, ln26) is z - ??

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Find an equation of the plane tangent to the following surface at the given points.
z=ln(1+xy)​; (5,5,ln26) and (−5,−5,ln26)
a)The tangent plane at (5,5,ln26) is z=??.
b) The tangent plane at (-5, -5, ln26) is z - ??
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