anonymous
  • anonymous
1+cos(8x)= A. 4cos(2x) B. 2sin^2(4x) C.4sin(2x) D.2cos^(4x)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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arindameducationusc
  • arindameducationusc
cos 2x=1-2sin^2x
arindameducationusc
  • arindameducationusc
use this
lυἶცἶ0210
  • lυἶცἶ0210
Try using \(\large cos^2x = \frac{1}{2} (1+cos(2x)) \)

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anonymous
  • anonymous
but how would I use it?
arindameducationusc
  • arindameducationusc
there is another identity... cos2x=2cos^2x-1
anonymous
  • anonymous
I'm sorry, I'm really confused
arindameducationusc
  • arindameducationusc
Answer is D, see how....
arindameducationusc
  • arindameducationusc
cos2x=2cos^2x-1 =>1+cos2x=2cos^2x now instead of 2x put 8x(left side) so in the right side its half of 8 that is 4. Got it?
anonymous
  • anonymous
yeah, i think so. thanks!
arindameducationusc
  • arindameducationusc
My pleasure

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