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anonymous

  • one year ago

express the tan(22.5) using the cos(45)

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  1. freckles
    • one year ago
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    \[22.5=\frac{45}{2} \\ \tan(\frac{45}{2}) =?..\text{ use half angle identity }\]

  2. freckles
    • one year ago
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    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
    • one year ago
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    I got -1-sqrt of 2 all over 1 so it seems right lol

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