I need to prove that:1+cos(a+b)−cos(a−b)=cos2(a)+cos2(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
How to find lim without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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