anonymous
  • anonymous
Can anyone please explain how to use Double and Half Angle formulas to find exact values?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
of what?
anonymous
  • anonymous
in trigonometry !
anonymous
  • anonymous
of any given number both on and off the Unit Circle. For example if I needed to find the a) sin(2x) b) cos(2x) c) sin(x/2) and d) (cos x/2) if the cos(x)=(3/5), 0

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anonymous
  • anonymous
\[\sin (2x)=2\sin x.\cos x\] \[\cos (2x)=\cos ^{2}x -\sin ^{2}x\] in which the angle 2x is divided by 2 .. if it was x/2 << divide it bye 2 to be x/4 |dw:1327542672309:dw|
anonymous
  • anonymous
|dw:1327542889414:dw|

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