- #1

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sin^4x-cos^4x = 1 - 2cos^2x

i tried the side more complicated first...but cant seem to hav any luck...other then maing it more complicated!!!

umm the x's are meant to be thetas...but didnlt ahv the symbol handy.and its meant to be read sign to he power 4 theta....really aprreciate any ideas for this one!!!