I need to prove that: $$1+\cos(a+b)-\cos(a-b)=\cos^2(a)+\cos^2(b)$$
I tried to start from both ways but it always took me back to the same one again I tried also to prove that their - equal zero but I didn't work also
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So if I have a matrix and I put it into RREF and keep track of the row operations, I can then write it as a product of elementary matrices. ...
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I am asked to prove the density of irrationals in $\mathbb{R}$. I understand how to do this by proving the density of $\mathbb{Q}$ first, na...
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Can someone just explain to me the basic process of what is going on here? I understand everything until we start adding 1's then after ...
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