anonymous
  • anonymous
Verify the identity. cos 4x + cos 2x = 2 - 2 sin2 2x - 2 sin2 x
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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Loser66
  • Loser66
I don't get why "verify" and then "increasing" "decreasing" hey, why do you delete your comments?
anonymous
  • anonymous
because it wasnt related to the question
ybarrap
  • ybarrap
\(\text{Proof that }\cos4x+\cos2x=2-2\sin^2 2x-2\sin^2 x\\\) \(=2-2\left [{1-\cos4x\over2} \right ]-2\left [{1-\cos2x\over2} \right ]\\\) \(=2-\left (1-\cos4x \right )-2\left (1-\cos2x \right )\\\) \(=\cos4x +\cos2x\\\)

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ybarrap
  • ybarrap
Let me know if you have any questions.
anonymous
  • anonymous
did you use a formula
ybarrap
  • ybarrap
The only formula used was the half-angle formula: \(\large \sin^2 x={1-\cos2x\over2}\). Have you seen this?
anonymous
  • anonymous
no i havent

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