anonymous
  • anonymous
If sinA = 2/3 find cos A/2 =? need help ASAP
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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misty1212
  • misty1212
HI!!
misty1212
  • misty1212
first find \(\cos(A)\)
misty1212
  • misty1212
then use \[\cos(\frac{A}{2})=\sqrt{\frac{1+\cos(A)}{2}}\]

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anonymous
  • anonymous
HOW to get cos A?
misty1212
  • misty1212
draw a triangle
misty1212
  • misty1212
|dw:1438137818903:dw|
misty1212
  • misty1212
there is a picture on an angle whose sine is \(\frac{2}{3}\) find the third side via pythagoras
misty1212
  • misty1212
once you have the missing side, you know the cosine let me know when you get it
anonymous
  • anonymous
Oh i get it ... i'll give it a try... with some other exercises
anonymous
  • anonymous
Waiting for lynfran's reply

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