anonymous
  • anonymous
cos(2⋅∠ABC)=?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
|dw:1370239782948:dw|
anonymous
  • anonymous
find angle ABC by using any trig function, sin, cos, or tan. once you've found the angle, multiply by 2, and find the cosine :)
anonymous
  • anonymous
Cant get u

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anonymous
  • anonymous
6/10
anonymous
  • anonymous
cos a = x/r
anonymous
  • anonymous
|dw:1370240065658:dw|
anonymous
  • anonymous
am I right
anonymous
  • anonymous
We don't know what ∠ABC is exactly, so we can't compute 2⋅∠ABC to directly evaluate this function. We do know what sin(∠ABC) and cos(∠ABC) are, though.
anonymous
  • anonymous
Thanks @yummydum for ur contribution
anonymous
  • anonymous
since you want to use cosine lets do that:\[\cos B={6\over10}\]\[B=\cos^{-1}\left(6\over10\right)\]\[B\approx53.13\]\[53.13\times2=106.26\]\[\cos(106.26)\approx6\]
anonymous
  • anonymous
umm..you're welcome (if that's not sarcasm)

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