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Um Ok, and how would you show that?

How would you show sin^ + cos^ = 1?

Yes. It is a rule. But, the proof has to do with the right triangle and pythagorean theorem.

latter

So how (when expanding the bracket) does it simplify to cos^2(theta)-sin^2(theta)?

Never mind. stupid question

Thanks for helping! I understand now

Haha, there are no stupid questions, please feel free to ask.

Good job!

I just realized! I would not have thought of it though... need to think more outside the box!

Sorry again, but again, It wasn't a stupid question... How does it simplify to that answer?

er typo... i meant sin^4 theta in the left side

You take the first equation, and put the value of cos^2 + sin^2 from the second equation in it.

Ohhhhh!

Thanks. Registration has finally hit!

That's great! I'm glad I was able to help