wampominater
  • wampominater
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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katieb
  • katieb
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wampominater
  • wampominater
looks like this \[\cos4x+\cos2x=2-2\sin^22x-2\sin^2x\]
LynFran
  • LynFran
using the double angle identity for cos cos2x=-2sin^2(x)+1 and cos4x= -2sin^2(2x)+1 so cos4x+cos2x \[(-2\sin ^{2}2x+1)+(-2\sin ^{2}x+1)\]
LynFran
  • LynFran
remove the brackets and u will get the right hand side...

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anonymous
  • anonymous
@LynFran sup
wampominater
  • wampominater
alright, Thank you!
anonymous
  • anonymous
@LynFran sup its me Peachesjpg I changed my name y u blocked me

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