identities.... i need help!

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candy:
Please show all the steps :'(
proving identities!!

sin^2xcos^2x=1/8(1-cos4x)

djammad:
solve the right hand side

djammad:
i dont get the question write in words :S

twilight:
i need help in this q too ...
how do u solve cos22x

twilight:
the q is
sin2x cos2x = 1/8(1- cos 4x)

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