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I'm solving a pretty descent trig identity question, but I'm stuck. I'm not going to type out the original question, but here the section that I'm stuck on: sin^4x + cos^4x and here is what I have to prove: 1-2sin^2xcos^2x
I know that I'm really close, I just can't get this section. Any help is much appreciated.
I know that I'm really close, I just can't get this section. Any help is much appreciated.