## anonymous one year ago express the tan(22.5) using the cos(45)

1. freckles

$22.5=\frac{45}{2} \\ \tan(\frac{45}{2}) =?..\text{ use half angle identity }$

2. freckles

you may also consider expressing sin(45) as cos(45) you can do this since sin(45)=cos(45) I'm only saying this since they want you to express your answer in terms of cos(45)

3. anonymous

I got -1-sqrt of 2 all over 1 so it seems right lol