Let $f ( x , y ) = x ^ { 2 } + 2 x \cos ^ { 2 } y$ .Give a linear approximation of f at the point $( 2 , \pi / 4 )$ .

Name: Let $f ( x , y ) = x ^ { 2 } + 2 x \cos ^ { 2 } y$ .Give a linear approximation of f at the point $( 2 , \pi / 4 )$ .
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The Answer of Let $f ( x , y ) = x ^ { 2 } + 2 x \cos ^ { 2 } y$ .Give a linear approximation of f at the point $( 2 , \pi / 4 )$ .

Let f(x,y)=x2+2xcos⁡2yf ( x , y ) = x ^ { 2 } + 2 x \cos ^ { 2 } yf(x,y)=x2+2xcos2y

Let $f ( x , y ) = x ^ { 2 } + 2 x \cos ^ { 2 } y$