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| Help with my trigonometry |
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| Maor:
So I have a test tomorrow and I'm stuck at one question. I need to prove these two equations equal. sin^4a-cos^4a = sin^2a-cos^2a Now, I have no idea what I can do from here, or how can I proceed, help please? |
| snot2:
they are the same but one has a 2 instead of a 4 |
| Maor:
--- Quote from: snot2 on October 21, 2009, 01:42:34 PM ---they are the same but with a 2 instead of a 4 --- End quote --- Snot, this is a serious moment. |
| Jetlok:
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| WhoDa?:
Maybe because both equal 1? |
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