chrisdbest
  • chrisdbest
Rewrite with only sin x and cos x. cos 3x (A) cos x - 4 cos x sin2x (B)-sin3x + 2 sin x cos x (C)-sin2x + 2 sin x cos x (D)2 sin2x cos x - 2 sin x cos x
Mathematics
katieb
  • katieb
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welshfella
  • welshfella
Hint cos 3x = cos(2x + x)
chrisdbest
  • chrisdbest
Ye s I know that.
chrisdbest
  • chrisdbest
I have a headache from a slip and fall accident and just don't feel like working. I will medal you if you have the correct answer.

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welshfella
  • welshfella
but I dont think we can use that anyway because cos ( a + b) = cosa cosb - sina sinb
chrisdbest
  • chrisdbest
-_-
chrisdbest
  • chrisdbest
So can someone please tell me the answer
welshfella
  • welshfella
Its not C because that simplifies to -sin 2x + sin2x = 0
chrisdbest
  • chrisdbest
ohkay
chrisdbest
  • chrisdbest
I know it's not D because I chose that and it was wrong
welshfella
  • welshfella
I cant convert cos 3x into any of the options . I think there might be an error in the question. I'll plug in x = 20 degrees and see if any of them work out to 0.5 (because cos 60 = 0.5)
chrisdbest
  • chrisdbest
try B then
welshfella
  • welshfella
- sin 60 + 2 cos 20 sin 20 = -0.2232 not that one
welshfella
  • welshfella
nor A - none of them equal cos 3x
welshfella
  • welshfella
thers a problem with the question
chrisdbest
  • chrisdbest
That's the beauty of Virtual School
LynFran
  • LynFran
Try https://www.symbolab.com/solver/trigonometric-identity-calculator
chrisdbest
  • chrisdbest
I know it's not D or B, because I just got it wrong and can't do it over again. I have been told it's not A or C by an elite, and I KEEP GETTING THE QUESTION WRONG!!!!

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