haleyelizabeth2017
  • haleyelizabeth2017
Use a half angle identity to find the exact value of sin 105 degrees.
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
Seems pretty straightforward :D What's cos(210) ?
haleyelizabeth2017
  • haleyelizabeth2017
\[-\frac{\sqrt{3}}{2}\]
anonymous
  • anonymous
Looks like you're good to go, then? Half-angle identity for sine is \[\Large \sin\left(\frac x2\right)=\pm \sqrt{\frac{1-\cos(x)}{2}}\] Now, just take x to be 210, and you'll get sin(105)

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haleyelizabeth2017
  • haleyelizabeth2017
hmm...interesting haha
haleyelizabeth2017
  • haleyelizabeth2017
That's none of my options... Sorry for not posting those to begin with, I don't like to give options because then people give direct answers haha
haleyelizabeth2017
  • haleyelizabeth2017

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