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

## 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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