Use the squared Identities to simplify 2cos^2 (x) * cos^2 (x)

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Use the squared Identities to simplify 2cos^2 (x) * cos^2 (x)

Mathematics
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uhmm... how simple do you want it I mean an easy one would be just 2cos^4(x) lol
a) 1-cos(4x) / 4 b) 1+4cos(2x)+cos(4x) / 4 c) 1+cos(4x) / 4 d) 1+4cos(2x)-cos(4x) / 4

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Other answers:

are you sure you haven't miswritten the second one?
b) 1+4cos(2x)+cos(4x) / 4
thats what i have
someone help!
write both \(\cos^2 x = \dfrac{1-\cos 2x}{2}\)
It must be a typo... I'm getting 1+4cos(2x)+cos(4x) + 3 / 4 sorry.
***\(\cos^2 x = \dfrac{1+\cos 2x}{2}\)
elementary mistake hartnn
and then expand it.
So my attempt leads to something similar to B but with +3 at the end. Either I'm wrong (not likely) or the question is wrong.
then using the same identity you'll need to write \(\Large \cos^2 2x = \dfrac{1+\cos 4x}{2}\)
ROOKIE MISTAKE!!!
sorry to everyone. I am so sorry
So I was right
so you got it now?
i must've made a huge typo
the question is 2sin^2 (x) cos^2x
sin. not cos. i can't believe i made that mistake.
okk, then write \(\large \sin^2 x = \dfrac{1-\cos 2x}{2}\) thats the only difference
Dang it I knew you made that mistake! Lol, it gives a difference of two squares at the top. I already did that. The answer is a. Can you see why?
I'd like to see sbsbrand's attempt! :)
yay it worked! thanks everyone that stayed to help me even tho i wrote the question wrong.......XD

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