How come cos^2u+sin^2u =2cos^2u - 1 = 1- 2sin^2u

Question

anonymous · Answer

Check the link...will help u http://mathscene.co.uk/t/F/Su57k02.htm

asnaseer · Answer

should your question be:$$\cos^2(u)-\sin^2(u)=2\cos^2(u)-1=1-2\sin^2(u)$$

anonymous · Answer

asnaseer I see the Equation button when writing a reply but not an original post...

asnaseer · Answer

I am not sure what you mean - what are you trying to do?

anonymous · Answer

Next time I post a question, I'd like the nicer format like yours, however I don't see the equation button when making a new post. I guess this is a technical support question :P

asnaseer · Answer

Yes - I see what you were asking now.
Even though there is no Equation button, if you know how to enter the $\LaTeX$ equations then you can still do so while typing up the question.

Inline equation elements like this $x^2=1$ are entered by enclosing them between $($ and $)$ characters.

Equations entered between $[$ and $]$ will appear on the next line. e.g. $$x^2=1$$is on the next line here.