## Question

###### $17-18 \text { Verify the linear approximation at }(0,0)$ $$ \sqrt{y+\cos ^{2} x} \approx 1+\frac{1}{2} y $$

$17-18 \text { Verify the linear approximation at }(0,0)$ $$ \sqrt{y+\cos ^{2} x} \approx 1+\frac{1}{2} y $$

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