$$\cos(2x)-\cos(3x)=0$$
I am trying to solve this equation but get stuck every time in the middle of the exercise. Can somebody help me please?
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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