Use the Differential Of $f ( x , y ) = x ^ { 2 } + 2 x \cos ^ { 2 } y$

question 117

Essay

Use the differential of $f ( x , y ) = x ^ { 2 } + 2 x \cos ^ { 2 } y$ to find a linear approximation of f at the point (1, $\pi$ /4).

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