## Question

###### Verify the identity algebraically. Use a graphing utility to check your result graphically. $$\sec \frac{u}{2}=\pm \sqrt{\frac{2 \tan u}{\tan u+\sin u}}$$

Verify the identity algebraically. Use a graphing utility to check your result graphically. $$\sec \frac{u}{2}=\pm \sqrt{\frac{2 \tan u}{\tan u+\sin u}}$$

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