Let $f$ is a function and not constant.Suppose $x,y\in \mathbb{R}$ and $$f(x + y) = f(x) + f(y) - 2f(xy)$$
What is $f(x)$?
How to find $\lim_{h\rightarrow 0}\frac{\sin(ha)}{h}$ without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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