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anonymous
 one year ago
1+cos(8x)=
A. 4cos(2x)
B. 2sin^2(4x)
C.4sin(2x)
D.2cos^(4x)
anonymous
 one year ago
1+cos(8x)= A. 4cos(2x) B. 2sin^2(4x) C.4sin(2x) D.2cos^(4x)

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arindameducationusc
 one year ago
Best ResponseYou've already chosen the best response.1cos 2x=12sin^2x

lυἶცἶ0210
 one year ago
Best ResponseYou've already chosen the best response.2Try using \(\large cos^2x = \frac{1}{2} (1+cos(2x)) \)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0but how would I use it?

arindameducationusc
 one year ago
Best ResponseYou've already chosen the best response.1there is another identity... cos2x=2cos^2x1

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I'm sorry, I'm really confused

arindameducationusc
 one year ago
Best ResponseYou've already chosen the best response.1Answer is D, see how....

arindameducationusc
 one year ago
Best ResponseYou've already chosen the best response.1cos2x=2cos^2x1 =>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
 one year ago
Best ResponseYou've already chosen the best response.0yeah, i think so. thanks!

arindameducationusc
 one year ago
Best ResponseYou've already chosen the best response.1My pleasure
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