Cosine is just a change in the argument of sine, and vice versa.
$$\sin(x+\pi/2)=\cos(x)$$$$\cos(x-\pi/2)=\sin(x)$$
So why do we have both of them? Do they both exist simply for convenience in defining the other trig functions?
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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